{"id":236,"date":"2023-07-10T18:34:04","date_gmt":"2023-07-10T18:34:04","guid":{"rendered":"https:\/\/mathority.org\/id\/persamaan-rumus-elips\/"},"modified":"2023-07-10T18:34:04","modified_gmt":"2023-07-10T18:34:04","slug":"persamaan-rumus-elips","status":"publish","type":"post","link":"https:\/\/mathority.org\/id\/persamaan-rumus-elips\/","title":{"rendered":"Persamaan elips"},"content":{"rendered":"<p>Di sini Anda akan menemukan cara menghitung persamaan (rumus) elips, apakah mempunyai titik asal sebagai pusatnya atau tidak. Anda juga akan mengetahui apa saja elemen elips, cara menghitungnya, dan kegunaannya. Selain itu, Anda akan dapat melihat contoh dan menyelesaikan latihan persamaan elips. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"formula-de-la-ecuacion-de-la-elipse\"><\/span> Rumus persamaan elips <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\"> Rumus <strong>persamaan elips<\/strong> dalam koordinat kartesius adalah:<\/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\"> Emas:<\/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> Dan<\/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> adalah koordinat pusat elips:<\/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> adalah jari-jari horizontal elips.<\/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> adalah jari-jari vertikal elips. <\/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=\"rumus persamaan elips\" 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> Persamaan elips berpusat pada titik asal<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> Jenis elips yang paling umum adalah elips yang pusatnya berada di titik asal koordinat, yaitu di titik (0,0). Inilah sebabnya kita akan melihat bagaimana mencari persamaan elips yang berpusat di titik asal.<\/p>\n<p> Berikut rumus persamaan elips:<\/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> Jika elips berpusat pada titik asal koordinat, berarti demikian<\/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> Dan<\/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> sama dengan 0, maka persamaannya adalah:<\/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> Ada ahli matematika yang juga menyebut ungkapan ini sebagai persamaan kanonik atau persamaan elips tereduksi.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"elementos-de-la-elipse\"><\/span> elemen elips<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Setelah kita melihat seperti apa persamaan elipsnya, kita akan melihat apa saja elemen-elemennya. Tapi pertama-tama, mari kita ingat apa sebenarnya elips:<\/p>\n<p> Elips merupakan garis datar, tertutup, melengkung mirip sekali dengan keliling, namun bentuknya lebih lonjong. Secara khusus, elips adalah tempat kedudukan semua titik pada suatu bidang yang jumlah jarak ke dua titik tetap lainnya (disebut fokus F dan F&#8217;) adalah konstan.<\/p>\n<p> Jadi, unsur-unsur elips adalah:<\/p>\n<ul>\n<li> <strong>Fokus<\/strong> : ini adalah titik tetap F dan F&#8217; (titik berwarna ungu pada gambar di bawah). Jumlah jarak antara titik mana pun pada elips dan setiap fokus adalah konstan untuk semua titik pada elips.<\/li>\n<li> <strong>Sumbu utama atau fokus<\/strong> : ini adalah sumbu simetri elips tempat titik fokus berada. Disebut juga sumbu mayor.<\/li>\n<li> <strong>Sumbu sekunder<\/strong> : merupakan sumbu simetri elips yang tegak lurus sumbu utama. Ini juga disebut sumbu minor dan berhubungan dengan garis bagi tegak lurus dari segmen yang menghubungkan fokus.<\/li>\n<li> <strong>Pusat<\/strong> : merupakan titik potong sumbu elips. Selain itu, ini adalah pusat simetri elips (titik oranye pada grafik).<\/li>\n<li> <strong>Titik<\/strong> : titik potong elips dengan sumbu simetrinya (titik hitam).<\/li>\n<li> <strong>Sumbu semi mayor atau sumbu utama:<\/strong> ruas yang dimulai dari pusat elips sampai ke titik sumbu utama.<\/li>\n<li> <strong>Sumbu semi minor atau sumbu sekunder:<\/strong> ruas antara pusat elips dan simpul sumbu sekunder.<\/li>\n<li> <strong>Panjang fokus<\/strong> : Ini adalah jarak antara dua titik fokus.<\/li>\n<li> <strong>Jarak semi fokus<\/strong> : sesuai dengan jarak antara pusat dan masing-masing titik fokus.<\/li>\n<li> <strong>Vektor radio<\/strong> : adalah segmen yang menghubungkan setiap titik elips ke setiap fokus (segmen biru pada grafik). <\/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=\"elemen elips\" 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> Hubungan antar elemen elips<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> Berbagai elemen elips saling terkait satu sama lain. Selain itu, hubungan antara keduanya sangat penting untuk latihan elips, karena biasanya diperlukan untuk menyelesaikan soal elips dan menentukan persamaannya.<\/p>\n<p class=\"has-text-align-left\"> Seperti yang kita lihat pada definisi elips di atas, jarak dari titik mana pun pada elips ke fokus F ditambah jarak dari titik yang sama ke fokus F&#8217; adalah konstan. Nah, nilai konstanta ini sama dengan dua kali ukuran sumbu semi mayor. Dengan kata lain, persamaan berikut berlaku untuk setiap titik pada elips:<\/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> Emas<\/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> Dan<\/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> adalah jarak dari titik P ke fokus F dan F&#8217; masing-masing dan<\/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> adalah panjang sumbu semi-fokus.<\/p>\n<p> Oleh karena itu, karena titik puncak sumbu sekunder berada tepat di tengah sumbu fokus, maka jarak titik fokus tersebut ke salah satu fokus setara dengan panjang sumbu semi primer (<\/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=\"persamaan pembuktian elips\" class=\"wp-image-2087\" width=\"332\" height=\"197\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Jadi, dari <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 Pythagoras<\/a> , kita dapat menemukan <strong>hubungan antara setengah sumbu utama, setengah sumbu sekunder, dan setengah panjang fokus:<\/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> Ingat rumus ini karena akan sangat berguna untuk menghitung hasil latihan dengan elips. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"excentricidad-de-la-elipse\"><\/span> Eksentrisitas elips<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Tentu saja, tidak semua elips itu sama, namun ada yang lebih memanjang dan ada yang lebih datar. Jadi, ada koefisien yang digunakan untuk mengukur kebulatan suatu elips. Koefisien ini disebut <strong>eksentrisitas<\/strong> dan dihitung dengan rumus berikut:<\/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> Emas<\/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> adalah jarak dari pusat elips ke salah satu fokusnya dan<\/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> panjang sumbu semi mayor. <\/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=\"eksentrisitas elips\" class=\"wp-image-2095\" width=\"669\" height=\"154\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Seperti terlihat pada representasi sebelumnya, semakin kecil nilai eksentrisitas elips maka semakin menyerupai lingkaran, sebaliknya semakin besar koefisien maka elips semakin rata. Selain itu, nilai eksentrisitas berkisar dari nol (lingkaran sempurna) hingga satu (garis horizontal), keduanya tidak inklusif.<\/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> \\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-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{F\\kiri(3+\\sqrt{24},1}\\kanan)} \\bm{F\\kiri(3-\\sqrt{24},1}\\kanan)}<\/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}{\\left(\\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> Terakhir, jika artikel ini bermanfaat bagi Anda, Anda pasti juga tertarik dengan halaman kami tentang <a href=\"https:\/\/mathority.org\/id\/contoh-persamaan-elemen-rumus-definisi-hiperbola-latihan-diselesaikan\/\">rumus hiperbola<\/a> dan <a href=\"https:\/\/mathority.org\/id\/contoh-persamaan-definisi-matematika-parabola-elemen-latihan-diselesaikan\/\">rumus parabola<\/a> . Anda akan menemukan penjelasan detail tentang apa itu hiperbola dan parabola, persamaannya, ciri-cirinya, contohnya, latihan penyelesaiannya,\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Di sini Anda akan menemukan cara menghitung persamaan (rumus) elips, apakah mempunyai titik asal sebagai pusatnya atau tidak. Anda juga akan mengetahui apa saja elemen elips, cara menghitungnya, dan kegunaannya. Selain itu, Anda akan dapat melihat contoh dan menyelesaikan latihan persamaan elips. Rumus persamaan elips Rumus persamaan elips dalam koordinat kartesius adalah: Emas: Dan adalah &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mathority.org\/id\/persamaan-rumus-elips\/\"> <span class=\"screen-reader-text\">Persamaan elips<\/span> Selengkapnya &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":[37],"tags":[],"class_list":["post-236","post","type-post","status-publish","format-standard","hentry","category-berbentuk-kerucut"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Persamaan elips - Mathoritas<\/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\/id\/persamaan-rumus-elips\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Persamaan elips - Mathoritas\" \/>\n<meta property=\"og:description\" content=\"Di sini Anda akan menemukan cara menghitung persamaan (rumus) elips, apakah mempunyai titik asal sebagai pusatnya atau tidak. Anda juga akan mengetahui apa saja elemen elips, cara menghitungnya, dan kegunaannya. Selain itu, Anda akan dapat melihat contoh dan menyelesaikan latihan persamaan elips. 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