{"id":239,"date":"2023-07-10T18:34:04","date_gmt":"2023-07-10T18:34:04","guid":{"rendered":"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/"},"modified":"2023-07-10T18:34:04","modified_gmt":"2023-07-10T18:34:04","slug":"equazione-della-formula-dellellisse","status":"publish","type":"post","link":"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/","title":{"rendered":"Equazione dell&#39;ellisse"},"content":{"rendered":"<p>Qui troverai come viene calcolata l&#8217;equazione (formula) dell&#8217;ellisse, indipendentemente dal fatto che abbia l&#8217;origine come centro o meno. Troverai anche quali sono gli elementi dell&#8217;ellisse, come calcolarli e a cosa servono. Inoltre, potrai vedere esempi ed esercizi risolti di equazioni dell&#8217;ellisse. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"formula-de-la-ecuacion-de-la-elipse\"><\/span> Formula dell&#8217;equazione dell&#8217;ellisse <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div style=\"background-color:#FFCC8080;padding-top: 20px; padding-bottom: 0.5px; padding-right: 30px; padding-left: 30px; border: 2px solid #FFB74D; border-radius:20px;\">\n<p style=\"text-align:left\"> La formula per l&#8217; <strong>equazione dell&#8217;ellisse<\/strong> in coordinate cartesiane \u00e8:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e29350c8a9f9271d7c58bb5636661eae_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\cfrac{(x-x_0)^2}{a^2}+\\cfrac{(y-y_0)^2}{b^2} = 1\" title=\"Rendered by QuickLaTeX.com\" height=\"41\" width=\"195\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p style=\"text-align:left; margin-bottom:4px\"> Oro:<\/p>\n<ul>\n<li>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-87f2a80bc63f8d7bc3df68c45a787402_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x_0\" title=\"Rendered by QuickLaTeX.com\" height=\"11\" width=\"17\" style=\"vertical-align: -3px;\"><\/p>\n<p> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d37dc47669aa63f72480eae663d99287_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y_0\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: -4px;\"><\/p>\n<p> sono le coordinate del centro dell&#8217;ellisse:<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a54160c9f13bae428a2471d905abd6f7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"C(x_0,y_0)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"69\" style=\"vertical-align: -5px;\"><\/p>\n<\/li>\n<li>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e8 il raggio orizzontale dell&#8217;ellisse.<\/li>\n<li>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"b\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e8 il raggio verticale dell&#8217;ellisse. <\/li>\n<\/ul>\n<\/div>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/equation-dune-ellipse.webp\" alt=\"formula dell'equazione dell'ellisse\" class=\"wp-image-2080\" width=\"408\" height=\"384\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ecuacion-de-la-elipse-centrada-en-el-origen\"><\/span> Equazione dell&#8217;ellisse centrata nell&#8217;origine<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> Un tipo molto comune di ellisse \u00e8 quella il cui centro \u00e8 all&#8217;origine delle coordinate, cio\u00e8 nel punto (0,0). Ecco perch\u00e9 vedremo come trovare l&#8217;equazione dell&#8217;ellisse centrata nell&#8217;origine.<\/p>\n<p> Seguendo la formula per l&#8217;equazione dell&#8217;ellisse:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e29350c8a9f9271d7c58bb5636661eae_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\cfrac{(x-x_0)^2}{a^2}+\\cfrac{(y-y_0)^2}{b^2} = 1\" title=\"Rendered by QuickLaTeX.com\" height=\"41\" width=\"195\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Se l&#8217;ellisse \u00e8 centrata sull&#8217;origine delle coordinate, significa che<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-87f2a80bc63f8d7bc3df68c45a787402_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x_0\" title=\"Rendered by QuickLaTeX.com\" height=\"11\" width=\"17\" style=\"vertical-align: -3px;\"><\/p>\n<p> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d37dc47669aa63f72480eae663d99287_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y_0\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: -4px;\"><\/p>\n<p> sono uguali a 0, quindi la tua equazione sar\u00e0:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-7821573c61c10361101554eb56041901_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\cfrac{\\bm{x^2}}{\\bm{a^2}}+\\cfrac{\\bm{y^2}}{\\bm{b^2}} \\bm{= 1}\" title=\"Rendered by QuickLaTeX.com\" height=\"41\" width=\"85\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Ci sono matematici che chiamano questa espressione anche equazione canonica o equazione ridotta dell&#8217;ellisse.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"elementos-de-la-elipse\"><\/span> elementi dell&#8217;ellisse<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Una volta che vediamo come appare l&#8217;equazione dell&#8217;ellisse, vedremo quali sono i suoi elementi. Ma prima ricordiamo cos&#8217;\u00e8 esattamente un&#8217;ellisse:<\/p>\n<p> L&#8217;ellisse \u00e8 una linea piatta, chiusa, curva, molto simile alla circonferenza, ma la sua forma \u00e8 pi\u00f9 ovale. In particolare, l&#8217;ellisse \u00e8 il luogo di tutti i punti di un piano la cui somma delle distanze da altri due punti fissi (detti fuochi F e F&#8217;) \u00e8 costante.<\/p>\n<p> Quindi gli elementi di un&#8217;ellisse sono:<\/p>\n<ul>\n<li> <strong>I fuochi<\/strong> : questi sono i punti fissi F e F&#8217; (punti colorati viola nell&#8217;immagine sotto). La somma delle distanze tra qualsiasi punto dell&#8217;ellisse e ciascun fuoco \u00e8 costante per tutti i punti dell&#8217;ellisse.<\/li>\n<li> <strong>Asse principale o focale<\/strong> : \u00e8 l&#8217;asse di simmetria dell&#8217;ellisse in cui si trovano i focali. Chiamato anche asse maggiore.<\/li>\n<li> <strong>Asse secondario<\/strong> : \u00e8 l&#8217;asse di simmetria dell&#8217;ellisse perpendicolare all&#8217;asse principale. \u00c8 detto anche asse minore e corrisponde alla bisettrice perpendicolare del segmento che congiunge i fuochi.<\/li>\n<li> <strong>Centro<\/strong> : \u00e8 il punto di intersezione degli assi dell&#8217;ellisse. Inoltre, \u00e8 il centro di simmetria dell&#8217;ellisse (punto arancione sul grafico).<\/li>\n<li> <strong>Vertici<\/strong> : punti di intersezione dell&#8217;ellisse con i suoi assi di simmetria (punti neri).<\/li>\n<li> <strong>Semiasse maggiore o asse principale:<\/strong> segmento che va dal centro dell&#8217;ellisse ai vertici dell&#8217;asse principale.<\/li>\n<li> <strong>Semiasse minore o asse secondario:<\/strong> segmento compreso tra il centro dell&#8217;ellisse ed i vertici dell&#8217;asse secondario.<\/li>\n<li> <strong>Lunghezza focale<\/strong> : questa \u00e8 la distanza tra i due punti focali.<\/li>\n<li> <strong>Distanza semifocale<\/strong> : corrisponde alla distanza tra il centro e ciascuno dei punti focali.<\/li>\n<li> <strong>I radiovettori<\/strong> : sono i segmenti che congiungono un qualsiasi punto dell&#8217;ellisse ad ogni fuoco (segmenti blu nel grafico). <\/li>\n<\/ul>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/elements-dellipse.webp\" alt=\"elementi di un'ellisse\" class=\"wp-image-2082\" width=\"581\" height=\"310\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"relacion-entre-los-elementos-de-una-elipse\"><\/span> Relazione tra gli elementi di un&#8217;ellisse<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> I diversi elementi di un&#8217;ellisse sono collegati tra loro. Inoltre, le relazioni tra loro sono molto importanti per gli esercizi sulle ellissi, perch\u00e9 di solito sono necessarie per risolvere problemi sulle ellissi e determinare le loro equazioni.<\/p>\n<p class=\"has-text-align-left\"> Come abbiamo visto sopra nella definizione dell&#8217;ellisse, la distanza da qualsiasi punto dell&#8217;ellisse al fuoco F pi\u00f9 la distanza dallo stesso punto al fuoco F&#8217; \u00e8 costante. Ebbene, questo valore costante \u00e8 pari al doppio di quanto misura il semiasse maggiore. In altre parole, per ogni punto dell\u2019ellisse vale la seguente uguaglianza:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-7cef5996a2621318273bd54d01594941_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"d(P,F) + d(P,F')= 2a\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"181\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Oro<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6be809958050006a77cc59c5b7c32557_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"d(P,F)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"56\" style=\"vertical-align: -5px;\"><\/p>\n<p> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-52cd58325f7f5f8ae50bf05b32b7ed55_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"d(P,F')\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"60\" style=\"vertical-align: -5px;\"><\/p>\n<p> \u00e8 la distanza dal punto P al fuoco F e F&#8217; rispettivamente e<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e8 la lunghezza dell&#8217;asse semifocale.<\/p>\n<p> Pertanto, poich\u00e9 il vertice dell&#8217;asse secondario si trova proprio al centro dell&#8217;asse focale, la distanza da esso a uno dei fuochi \u00e8 equivalente alla lunghezza dell&#8217;asse semiprimario (<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> ): <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/relation-delements-dellipse.webp\" alt=\"Equazione di prova dell'ellisse\" class=\"wp-image-2087\" width=\"332\" height=\"197\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Quindi, dal <a href=\"https:\/\/www.ecured.cu\/Teorema_de_Pit%C3%A1goras\" target=\"_blank\" aria-label=\"undefined (abre en una nueva pesta\u00f1a)\" rel=\"noreferrer noopener\">teorema di Pitagora<\/a> , \u00e8 possibile ricavare <strong>la relazione che esiste tra il semiasse principale, il semiasse secondario e la semilunghezza focale:<\/strong><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f07be3767557be2f8c17fc9a226a2506_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a^2=b^2+c^2\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"93\" style=\"vertical-align: -2px;\"><\/p>\n<\/p>\n<p> Ricorda questa formula perch\u00e9 sar\u00e0 molto utile per calcolare i risultati degli esercizi con i puntini di sospensione. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"excentricidad-de-la-elipse\"><\/span> Eccentricit\u00e0 dell&#8217;ellisse<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Ovviamente non tutte le ellissi sono uguali, ma alcune sono pi\u00f9 allungate ed altre pi\u00f9 appiattite. Quindi, esiste un coefficiente che viene utilizzato per misurare quanto \u00e8 arrotondata una determinata ellisse. Questo coefficiente si chiama <strong>eccentricit\u00e0<\/strong> e si calcola con la seguente formula:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-01e68e598b53e74e9420afdb1bf6ab66_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"e = \\cfrac{c}{a}\" title=\"Rendered by QuickLaTeX.com\" height=\"34\" width=\"44\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Oro<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-41a04eeea923a1a0c28094a8a4680525_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"c\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e8 la distanza dal centro dell&#8217;ellisse a uno dei suoi fuochi e<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> la lunghezza del semiasse maggiore. <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/excentricite-dellipse.webp\" alt=\"eccentricit\u00e0 dell'ellisse\" class=\"wp-image-2095\" width=\"669\" height=\"154\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Come puoi vedere nella rappresentazione precedente, minore \u00e8 il valore dell&#8217;eccentricit\u00e0 dell&#8217;ellisse, pi\u00f9 assomiglia ad un cerchio, invece, maggiore \u00e8 il coefficiente, pi\u00f9 l&#8217;ellisse \u00e8 appiattita. Inoltre, il valore dell&#8217;eccentricit\u00e0 varia da zero (cerchio perfetto) a uno (linea orizzontale), entrambi esclusi.<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d7cba3912f2e788be4e73f1e18c9fb21_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"0\n\n<h2 class=&quot;wp-block-heading&quot;><span class=&quot;ez-toc-section&quot; id=&quot;ejemplo-de-como-calcular-la-ecuacion-de-la-elipse&quot;><\/span> Exemple de calcul de l&#8217;\u00e9quation de l&#8217;ellipse<span class=&quot;ez-toc-section-end&quot;><\/span><\/h2>\n<p> Une fois que nous avons vu toutes les propri\u00e9t\u00e9s de l&#8217;ellipse, nous allons r\u00e9soudre un probl\u00e8me d&#8217;ellipse \u00e0 titre d&#8217;exemple :<\/p>\n<ul>\n<li> Trouver l&#8217;\u00e9quation de l&#8217;ellipse dont le demi-axe principal mesure 5 unit\u00e9s (et est parall\u00e8le \u00e0 l&#8217;axe OX), son centre est le point C(4,-1) et la distance de son centre \u00e0 un foyer est de 4 unit\u00e9s.<\/li>\n<\/ul>\n<p> <strong>Pour d\u00e9terminer l&#8217;\u00e9quation d&#8217;une ellipse, nous avons besoin de la longueur du demi-axe principal, de la longueur du demi-axe secondaire et des coordonn\u00e9es de son point.<\/strong> Par cons\u00e9quent, dans ce cas, nous n&#8217;avons besoin de conna\u00eetre que l&#8217;axe semi-secondaire. Ainsi, pour calculer la longueur mesur\u00e9e par l&#8217;axe semi-secondaire, nous pouvons utiliser la relation entre l&#8217;axe semi-principal, l&#8217;axe semi-secondaire et la distance semi-focale : &#8221; title=&#8221;Rendered by QuickLaTeX.com&#8221; height=&#8221;215&#8243; width=&#8221;2133&#8243; style=&#8221;vertical-align: -5px;&#8221;><\/p>\n<p> a^2=b^2+c^2 b^2=a^2-c^2 b=\\sqrt{a^2-c^2} = \\sqrt{5^2-4^2}=\\sqrt {9} = 3<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0ac0d898ef827d924f8a7972d18a3d37_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Et une fois que l'on conna\u00eet la longueur des deux demi-axes et son centre, on peut trouver l'\u00e9quation de l'ellipse \u00e0 l'aide de sa formule : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"977\" style=\"vertical-align: -4px;\"><\/p>\n<p> \\cfrac{(x-x_0)^2}{a^2}+\\cfrac{(y-y_0)^2}{b^2} = 1\\cfrac{(x-4)^2}{5^2 }+\\cfrac{(y-(-1))^2}{3^2} = 1\\cfrac{\\bm{(x-4)^2}}{\\bm{25}}+\\cfrac{\\ bm{(y+1)^2}}{\\bm{9}} \\bm{= 1}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4c8518a77b08b28dd3989532a9c1a0bd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\n\n<h2 class=&quot;wp-block-heading&quot;><span class=&quot;ez-toc-section&quot; id=&quot;ejercicios-resueltos-de-la-ecuacion-de-la-elipse&quot;><\/span> Probl\u00e8mes r\u00e9solus de l&#8217;\u00e9quation de l&#8217;ellipse<span class=&quot;ez-toc-section-end&quot;><\/span><\/h2>\n<h3 class=&quot;wp-block-heading&quot;> Exercice 1<\/h3>\n<p> Quelle est l&#8217;\u00e9quation de l&#8217;ellipse centr\u00e9e au point C(2,0) dont l&#8217;axe semi-principal (parall\u00e8le \u00e0 l&#8217;axe X) et l&#8217;axe secondaire mesurent respectivement 6 et 3 unit\u00e9s ? Repr\u00e9senter graphiquement ladite ellipse. <\/p>\n<div class=&quot;wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E4F0FE&quot; role=&quot;button&quot; tabindex=&quot;0&quot; aria-expanded=&quot;false&quot; data-otfm-spc=&quot;#E4F0FE&quot; style=&quot;text-align:center&quot;>\n<div class=&quot;otfm-sp__title&quot;> <strong>voir solution<\/strong><\/div>\n<\/div>\n<p> L&#8217;\u00e9quation de l&#8217;ellipse est la suivante :&#8221; title=&#8221;Rendered by QuickLaTeX.com&#8221; height=&#8221;208&#8243; width=&#8221;1595&#8243; style=&#8221;vertical-align: -20px;&#8221;><\/p>\n<p> \\cfrac{(x-x_0)^2}{a^2}+\\cfrac{(y-y_0)^2}{b^2} = 1<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-1a535f3c26d0c91d21ff2802c71cb131_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Par cons\u00e9quent, \u00e0 partir des donn\u00e9es de l'\u00e9nonc\u00e9, nous pouvons compl\u00e9ter l'\u00e9quation de l'ellipse : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"709\" style=\"vertical-align: -4px;\"><\/p>\n<p> \\cfrac{(x-2)^2}{6^2}+\\cfrac{(y-0)^2}{3^2} = 1\\cfrac{\\bm{(x-2)^2}} {\\bm{36}}+\\cfrac{\\bm{y^2}}{\\bm{9}} \\bm{= 1}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e674e398f6c61cceb56ebc7d6849b2b7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Et une fois que nous connaissons l'\u00e9quation de l'ellipse, nous pouvons tracer la figure : \n\n<div class=&quot;wp-block-image&quot;>\n<figure class=&quot;aligncenter size-large is-resized&quot;><img decoding=&quot;async&quot; loading=&quot;lazy&quot; src=&quot;https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/centre-de-lellipse-de-lequation-a-lexterieur-de-lorigine.webp&quot; alt=&quot;\u00e9quation de l'ellipse avec le centre hors de l'origine&quot; class=&quot;wp-image-2106&quot; width=&quot;524&quot; height=&quot;368&quot; srcset=&quot;&quot; sizes=&quot;&quot;><\/figure>\n<\/div>\n<div class=&quot;wp-block-otfm-box-spoiler-end otfm-sp_end&quot;><\/div>\n<h3 class=&quot;wp-block-heading&quot;> Exercice 2<\/h3>\n<p> Calculer l&#8217;\u00e9quation de l&#8217;ellipse dont le demi-axe principal (parall\u00e8le \u00e0 l&#8217;axe des abscisses) mesure 13 unit\u00e9s, son centre est l&#8217;origine des coordonn\u00e9es et la distance de son centre \u00e0 l&#8217;un de ses foyers est de 5 unit\u00e9s. <\/p>\n<div class=&quot;wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E4F0FE&quot; role=&quot;button&quot; tabindex=&quot;0&quot; aria-expanded=&quot;false&quot; data-otfm-spc=&quot;#E4F0FE&quot; style=&quot;text-align:center&quot;>\n<div class=&quot;otfm-sp__title&quot;> <strong>voir solution<\/strong><\/div>\n<\/div>\n<p> Pour calculer l&#8217;\u00e9quation de l&#8217;ellipse, nous devons savoir combien de temps mesure l&#8217;axe semi-secondaire. Et, pour cela, on peut utiliser la relation math\u00e9matique qui existe entre le demi-axe principal, le demi-axe secondaire et la demi-distance focale : &#8221; title=&#8221;Rendered by QuickLaTeX.com&#8221; height=&#8221;299&#8243; width=&#8221;2688&#8243; style=&#8221;vertical-align: -20px;&#8221;><\/p>\n<p> a^2=b^2+c^2 b^2=a^2-c^2 b=\\sqrt{a^2-c^2} = \\sqrt{13^2-5^2}=\\sqrt {144} = 12<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bcf056c99846b69f1bf4ed5ce1e6552a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Et une fois que l'on conna\u00eet la longueur des deux demi-axes et son centre, on peut trouver l'\u00e9quation de l'ellipse gr\u00e2ce \u00e0 sa formule : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"960\" style=\"vertical-align: -4px;\"><\/p>\n<p> \\cfrac{(x-x_0)^2}{a^2}+\\cfrac{(y-y_0)^2}{b^2} = 1\\cfrac{(x-0)^2}{13^2 }+\\cfrac{(y-0)^2}{12^2} = 1\\cfrac{\\bm{x^2}}{\\bm{169}}+\\cfrac{\\bm{y^2}} {\\bm{144}} \\bm{= 1}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9e53a75087af9221fe85fa404a4045ff_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\n\n<div class=&quot;wp-block-otfm-box-spoiler-end otfm-sp_end&quot;><\/div>\n<h3 class=&quot;wp-block-heading&quot;> Exercice 3<\/h3>\n<p> D\u00e9terminer l&#8217;\u00e9quation de l&#8217;ellipse suivante et les coordonn\u00e9es de ses foyers : <\/p>\n<div class=&quot;wp-block-image&quot;>\n<figure class=&quot;aligncenter size-large is-resized&quot;><img decoding=&quot;async&quot; loading=&quot;lazy&quot; src=&quot;https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/exercices-resolus-de-lequation-de-lellipse.webp&quot; alt=&quot;exercices r\u00e9solus pas \u00e0 pas d'\u00e9quations d'ellipses&quot; class=&quot;wp-image-2111&quot; width=&quot;533&quot; height=&quot;404&quot; srcset=&quot;&quot; sizes=&quot;&quot;><\/figure>\n<\/div>\n<div class=&quot;wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E4F0FE&quot; role=&quot;button&quot; tabindex=&quot;0&quot; aria-expanded=&quot;false&quot; data-otfm-spc=&quot;#E4F0FE&quot; style=&quot;text-align:center&quot;>\n<div class=&quot;otfm-sp__title&quot;> <strong>voir solution<\/strong><\/div>\n<\/div>\n<p> Les sommets horizontaux de l&#8217;ellipse sont les points (-4,1) et (10,1). Par cons\u00e9quent, son diam\u00e8tre horizontal et son rayon sont : &#8221; title=&#8221;Rendered by QuickLaTeX.com&#8221; height=&#8221;252&#8243; width=&#8221;2047&#8243; style=&#8221;vertical-align: -20px;&#8221;><\/p>\n<p> d_h=10-(-4) =14 a =\\cfrac{14}{2} = 7<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-76aa999f562c86113192c06e01991927_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" De m\u00eame, les sommets verticaux de l'ellipse sont les points (3,6) et (3,-4). Par cons\u00e9quent, son diam\u00e8tre vertical et son rayon sont : \" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"963\" style=\"vertical-align: -5px;\"><\/p>\n<p> d_v=6-(-4) =10 b =\\cfrac{10}{2} = 5<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0ac099c741c43ec962a36c7b2bba5d06_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Il suffit donc de trouver les coordonn\u00e9es du centre de l'ellipse, qui correspondent aux milieux des extr\u00e9mit\u00e9s de l'ellipse : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"884\" style=\"vertical-align: -4px;\"><\/p>\n<p> C_x= \\cfrac{10+(-4)}{2} = \\cfrac{6}{2} =3 C_y= \\cfrac{6+(-4)}{2} = \\cfrac{2}{ 2} = 1C(3.1)<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-51217c6f75e2ad233a651376f2ded0e0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Enfin, l'\u00e9quation de l'ellipse est : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"249\" style=\"vertical-align: -4px;\"><\/p>\n<p> \\cfrac{(x-x_0)^2}{a^2}+\\cfrac{(y-y_0)^2}{b^2} = 1\\cfrac{(x-3)^2}{7^2 }+\\cfrac{(y-1)^2}{5^2} =1\\cfrac{\\bm{(x-3)^2}}{\\bm{49}}+\\cfrac{\\bm{( y-1)^2}}{\\bm{25}} \\bm{= 1}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-310ed81b139fc6b5d3902b75bed66c9b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" D'autre part, la distance semi-focale vaut : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"339\" style=\"vertical-align: -4px;\"><\/p>\n<p> a^2=b^2+c^2 c^2=a^2-b^2 c=\\sqrt{a^2-b^2} = \\sqrt{7^2-5^2}=\\sqrt {24}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-1653b114c298901c587b9af56e4b0c40_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Cela signifie que les foyers de l'ellipse sont situ\u00e9s \u00e0 une distance horizontale de\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"578\" style=\"vertical-align: -4px;\"><\/p>\n<p> \\qrt{24}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6f5155fae442053fd60dec7ee847fe0f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"unit\u00e9s du centre de l'ellipse, donc les coordonn\u00e9es des foyers sont : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"483\" style=\"vertical-align: -4px;\"><\/p>\n<p> C(3,1) \\bm{FA\\sinistra(3+\\quadrato{24},1}\\destra)} \\bm{FA\\sinistra(3-\\quadrato{24},1}\\destra)}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-7d494da27f7cde61e219586567d178c8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\n\n<div class=&quot;wp-block-otfm-box-spoiler-end otfm-sp_end&quot;><\/div>\n<h3 class=&quot;wp-block-heading&quot;> Exercice 4<\/h3>\n<p> Calculez l&#8217;\u00e9quation de l&#8217;ellipse qui r\u00e9pond aux caract\u00e9ristiques suivantes :<\/p>\n<ul>\n<li> Son centre est l&#8217;origine des coordonn\u00e9es du plan cart\u00e9sien.<\/li>\n<li> Sa distance focale est \u00e9gale \u00e0 6 unit\u00e9s.<\/li>\n<li> Un point de l&#8217;ellipse est \u00e0 3 et 5 unit\u00e9s de ses foyers. <\/li>\n<\/ul>\n<div class=&quot;wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E4F0FE&quot; role=&quot;button&quot; tabindex=&quot;0&quot; aria-expanded=&quot;false&quot; data-otfm-spc=&quot;#E4F0FE&quot; style=&quot;text-align:center&quot;>\n<div class=&quot;otfm-sp__title&quot;> <strong>voir solution<\/strong><\/div>\n<\/div>\n<p> On peut calculer la demi-focale \u00e0 partir de la focale : &#8221; title=&#8221;Rendered by QuickLaTeX.com&#8221; height=&#8221;185&#8243; width=&#8221;1667&#8243; style=&#8221;vertical-align: -19px;&#8221;><\/p>\n<p> 2c = 6 c=\\cfrac{6}{2} c=3<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ae016b9237aee40e4130230eb495fe6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" D'autre part, on sait par la d\u00e9finition de l'ellipse que la somme des distances de chacun de ses points \u00e0 ses foyers est \u00e9quivalente \u00e0 la longueur de son axe principal, donc : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"1214\" style=\"vertical-align: -4px;\"><\/p>\n<p> d(P,F) + d(P,F&#8217;)= 2a 3+5= 2a 8= 2a \\cfrac{8}{2}= a 4= a<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-615d5b2ccb4a343777d9d707806526ab_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Par cons\u00e9quent, la longueur du demi-axe secondaire de l'ellipse vaut : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"529\" style=\"vertical-align: -4px;\"><\/p>\n<p> a^2=b^2+c^2 b^2=a^2-c^2 b=\\sqrt{a^2-c^2} = \\sqrt{4^2-3^2}=\\sqrt {7}<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-98a1c514fb7344ec3be2558c5a559feb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" Et, en conclusion, l'\u00e9quation de l'ellipse est : \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"328\" style=\"vertical-align: -4px;\"><\/p>\n<p> \\cfrac{(x-x_0)^2}{a^2}+\\cfrac{(y-y_0)^2}{b^2} = 1\\cfrac{(x-0)^2}{4^2 }+\\cfrac{(y-0)^2}{\\sinistra(\\sqrt{7}\\right)^2} =1\\cfrac{\\bm{x^2}}{\\bm{16}}+\\ cfrac{\\bm{y^2}}{\\bm{7}} \\bm{= 1}$<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<p> Infine, se questo articolo ti \u00e8 stato utile, sicuramente ti interesseranno anche le nostre pagine sulla <a href=\"https:\/\/mathority.org\/it\/definizione-di-iperbole-elementi-di-formula-esempi-di-equazioni-esercizio-risolto\/\">formula dell&#8217;iperbole<\/a> e sulla <a href=\"https:\/\/mathority.org\/it\/parabola-definizione-matematica-esempi-di-equazioni-esercizi-elementi-risolti\/\">formula della parabola<\/a> . Troverai una spiegazione dettagliata di cosa sono l&#8217;iperbole e la parabola, le loro equazioni, le loro caratteristiche, esempi, esercizi risolti,\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Qui troverai come viene calcolata l&#8217;equazione (formula) dell&#8217;ellisse, indipendentemente dal fatto che abbia l&#8217;origine come centro o meno. Troverai anche quali sono gli elementi dell&#8217;ellisse, come calcolarli e a cosa servono. Inoltre, potrai vedere esempi ed esercizi risolti di equazioni dell&#8217;ellisse. Formula dell&#8217;equazione dell&#8217;ellisse La formula per l&#8217; equazione dell&#8217;ellisse in coordinate cartesiane \u00e8: Oro: &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/\"> <span class=\"screen-reader-text\">Equazione dell&#39;ellisse<\/span> Leggi altro &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-239","post","type-post","status-publish","format-standard","hentry","category-conico"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Equazione dell&#039;ellisse - Mathority<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Equazione dell&#039;ellisse - Mathority\" \/>\n<meta property=\"og:description\" content=\"Qui troverai come viene calcolata l&#8217;equazione (formula) dell&#8217;ellisse, indipendentemente dal fatto che abbia l&#8217;origine come centro o meno. Troverai anche quali sono gli elementi dell&#8217;ellisse, come calcolarli e a cosa servono. Inoltre, potrai vedere esempi ed esercizi risolti di equazioni dell&#8217;ellisse. Formula dell&#8217;equazione dell&#8217;ellisse La formula per l&#8217; equazione dell&#8217;ellisse in coordinate cartesiane \u00e8: Oro: &hellip; Equazione dell&#039;ellisse Leggi altro &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-10T18:34:04+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e29350c8a9f9271d7c58bb5636661eae_l3.png\" \/>\n<meta name=\"author\" content=\"Squadra di Mathority\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"Squadra di Mathority\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/\"},\"author\":{\"name\":\"Squadra di Mathority\",\"@id\":\"https:\/\/mathority.org\/it\/#\/schema\/person\/8d6f69ffbe48aea8b43675a9a3ddb9c8\"},\"headline\":\"Equazione dell&#39;ellisse\",\"datePublished\":\"2023-07-10T18:34:04+00:00\",\"dateModified\":\"2023-07-10T18:34:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/\"},\"wordCount\":970,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/mathority.org\/it\/#organization\"},\"articleSection\":[\"Conico\"],\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/\",\"url\":\"https:\/\/mathority.org\/it\/equazione-della-formula-dellellisse\/\",\"name\":\"Equazione dell&#39;ellisse - 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