{"id":239841,"date":"2019-02-22T12:50:26","date_gmt":"2019-02-22T05:50:26","guid":{"rendered":"https:\/\/www.quipper.com\/id\/blog\/?p=239841"},"modified":"2021-11-24T18:36:02","modified_gmt":"2021-11-24T11:36:02","slug":"sudut-istimewa-dalam-trigonometri","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/sudut-istimewa-dalam-trigonometri\/","title":{"rendered":"Seberapa Istimewa Sih Sudut Istimewa dalam Trigonometri? Simak Teorinya, Yuk!"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-240071\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/e339d-sudut-istimewa-dalam-trigonometri16.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/e339d-sudut-istimewa-dalam-trigonometri16.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/e339d-sudut-istimewa-dalam-trigonometri16-768x512.png 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/e339d-sudut-istimewa-dalam-trigonometri16-585x390.png?crop=1 585w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/e339d-sudut-istimewa-dalam-trigonometri16-263x175.png?crop=1 263w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight:400;\">Ketika belajar matematika, terutama bab mengenai trigonometri, Quipperian pasti dikenalkan dengan istilah sudut istimewa. Besar derajat dari sudut-sudut istimewa tersebut, antara lain 30<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">, 45<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">, 60<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">, dan 90<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">. Ngomong-ngomong, kenapa ya, sudut-sudut itu diberi nama sudut istimewa? Memang apa istimewanya sudut tersebut bila dibandingkan dengan sudut lainnya? Bagaimana cara memperoleh keistimewaan itu? Lalu, apa hubungannya dengan trigonometri? Untuk bisa menjawab pertanyaan di atas, simak penjelasan berikut, yuk, Quipperian!<\/span><\/p>\n<h2><strong>Keistimewaan Sudut Istimewa<\/strong><\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-240061\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/4687a-sudut-istimewa-dalam-trigonometri17.png\" alt=\"\" width=\"800\" height=\"533\"><\/p>\n<p><span style=\"font-weight:400;\">Jika ditanya nilai dari sin 23<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">, apa yang akan Quipperian lakukan? Menghitung nilainya menggunakan rumus atau grafik, bertanya pada guru dan teman, atau menghitung menggunakan kalkulator? <\/span><\/p>\n<p><span style=\"font-weight:400;\">Ya, biasanya, untuk mencari nilai dari sinus, kosinus, maupun tangen sudut tertentu, kita tidak punya jalan lain selain menggunakan alat bantu berupa kalkulator agar bisa menemukan jawaban dengan cepat. Akan tetapi untuk beberapa sudut, kita tidak perlu lagi mengandalkan alat bantu hitung, <\/span><em><span style=\"font-weight:400;\">lho<\/span><\/em><span style=\"font-weight:400;\">! <\/span><\/p>\n<p><span style=\"font-weight:400;\">Kenapa begitu? Karena sudut-sudut ini, yang kemudian lebih sering disebut dengan sudut istimewa, memiliki hubungan dengan rasio sisi-sisi segitiga! Penasaran bagaimana hubungannya? Lanjut membaca pembahasan di bawah ini, ya!<\/span><\/p>\n<h2><strong>Keistimewaan Sudut 45<\/strong><sup><strong>o<\/strong><\/sup><strong> dan 90<\/strong><sup><strong>o<\/strong><\/sup><strong> pada Segitiga dan Trigonometri<\/strong><\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-240051\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/d8b69-sudut-istimewa-dalam-trigonometri18.png\" alt=\"\" width=\"800\" height=\"533\"><\/p>\n<p><span style=\"font-weight:400;\">Keistimewaan sudut istimewa memang tidak bisa terlepas dari segitiga dan trigonometri, Quipperian. Hal ini dikarenakan sifat istimewa tersebut memang memenuhi kondisi suatu segitiga tertentu. <\/span><\/p>\n<p><span style=\"font-weight:400;\">Contohnya saja sudut istimewa 45<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> dan 90<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">. Misalkan kita bentuk segitiga yang memiliki sudut 45<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> dan 90<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">. Seperti yang Quipperian ketahui, total sudut pada segitiga adalah 180<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">. Jika segitiga tersebut sudah memiliki sudut 45<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> dan 90<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> maka sudut terakhir yang dimiliki adalah 45<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> sehingga membentuk segitiga samakaki seperti berikut:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239991\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/b9b62-sudut-istimewa-dalam-trigonometri1.png\" alt=\"\" width=\"229\" height=\"135\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239971\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/a22a0-sudut-istimewa-dalam-trigonometri2.png\" alt=\"\" width=\"395\" height=\"162\"><\/p>\n<p><span style=\"font-weight:400;\">Jadi, jika dimisalkan panjang AC = BC = 8 cm maka<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239981\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/d93c0-sudut-istimewa-dalam-trigonometri3.png\" alt=\"\" width=\"193\" height=\"22\"><\/p>\n<p><span style=\"font-weight:400;\">dan diperoleh:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239951\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/fc951-sudut-istimewa-dalam-trigonometri4.png\" alt=\"\" width=\"227\" height=\"150\"><\/p>\n<p><span style=\"font-weight:400;\">Pada segitiga siku-siku, sinus suatu sudut didefinisikan sebagai rasio antara panjang sisi depan sudut dengan sisi miring. Jadi, nilai dari sinus sudut A adalah rasio antara sisi BC dengan AB seperti berikut:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239961\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/90058-sudut-istimewa-dalam-trigonometri5.png\" alt=\"\" width=\"89\" height=\"62\"><\/p>\n<p><span style=\"font-weight:400;\">Karena pada rasio selalu digunakan perbandingan paling sederhana, maka bentuk di atas diubah menjadi:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239931\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/d6400-sudut-istimewa-dalam-trigonometri6.png\" alt=\"\" width=\"129\" height=\"32\"><\/p>\n<p><span style=\"font-weight:400;\">Dengan mengetahui rasio sisi-sisi segitiga yang mengandung sudut istimewa 45<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> dan 90<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">, Quipperian bisa menentukan nilai dari sinus, kosinus, maupun tangen sudut tersebut tanpa perlu menggunakan kalkulator lagi! Istimewa, bukan?<\/span><\/p>\n<h2><strong>Keistimewaan Sudut 30<\/strong><sup><strong>o<\/strong><\/sup><strong> dan 60<\/strong><sup><strong>o<\/strong><\/sup><strong> pada Segitiga dan Trigonometri<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-240001\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/cc859-sudut-istimewa-dalam-trigonometri19.png\" alt=\"\" width=\"800\" height=\"533\"><\/p>\n<p><span style=\"font-weight:400;\">Serupa dengan sudut istimewa sebelumnya, terlebih dulu kita gambarkan segitiga siku-siku dengan dua sudut lainnya ialah 30<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> dan 60<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> seperti berikut:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239941\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/bbafb-sudut-istimewa-dalam-trigonometri7.png\" alt=\"\" width=\"108\" height=\"146\"><\/p>\n<p><span style=\"font-weight:400;\">Untuk bisa menentukan rasio sisi-sisi segitiga, kita buat cerminan segitiga di atas lalu tempelkan menjadi seperti berikut:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239911\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/e446f-sudut-istimewa-dalam-trigonometri8.png\" alt=\"\" width=\"174\" height=\"152\"><\/p>\n<p><span style=\"font-weight:400;\">Dari gambar segitiga ADC, diperoleh bahwa total besar sudut C adalah 60<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">, sama dengan besar sudut A dan D. Oleh karena seluruh sudut segitiga memiliki besar yang sama, yaitu 60<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\">, maka segitiga ADC merupakan segitiga samasisi sehingga panjang AC = AD = DC.<\/span><\/p>\n<p><span style=\"font-weight:400;\">Selanjutnya misalkan AC = 8 cm. Karena ADC merupakan segitiga samasisi, maka AD = AC = 8 cm. Kemudian karena segitiga BDC merupakan duplikasi dari segitiga ABC, maka panjang AB = BD = \u00bd AD = 4 cm sehingga diperoleh gambar seperti berikut:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239921\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/528e6-sudut-istimewa-dalam-trigonometri9.png\" alt=\"\" width=\"96\" height=\"157\"><\/p>\n<p><span style=\"font-weight:400;\">Berikutnya nilai BC dapat diperoleh menggunakan Teorema Phytagoras:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239881\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/828a8-sudut-istimewa-dalam-trigonometri10.png\" alt=\"\" width=\"356\" height=\"65\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239901\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/75635-sudut-istimewa-dalam-trigonometri11.png\" alt=\"\" width=\"130\" height=\"157\"><\/p>\n<p><span style=\"font-weight:400;\">Seperti pada pembahasan sebelumnya, sinus suatu sudut didefinisikan sebagai rasio antara panjang sisi depan sudut dengan sisi miring. Jadi, nilai dari sinus sudut A adalah rasio antara sisi BC dengan AC seperti berikut:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239891\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/2f276-sudut-istimewa-dalam-trigonometri12.png\" alt=\"\" width=\"88\" height=\"62\"><\/p>\n<p><span style=\"font-weight:400;\">Karena pada rasio selalu digunakan perbandingan paling sederhana, maka bentuk di atas diubah menjadi:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239871\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/c19da-sudut-istimewa-dalam-trigonometri13.png\" alt=\"\" width=\"97\" height=\"29\"><\/p>\n<p><span style=\"font-weight:400;\">Selanjutnya, misalkan akan dihitung juga nilai kosinus dari sudut A. Kosinus suatu sudut didefinisikan sebagai rasio antara panjang sisi samping sudut dengan sisi miring. Jadi, nilai dari kosinus sudut A adalah rasio antara sisi AB dengan AC seperti berikut:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239861\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/3a53b-sudut-istimewa-dalam-trigonometri14.png\" alt=\"\" width=\"78\" height=\"58\"><\/p>\n<p><span style=\"font-weight:400;\">Karena pada rasio selalu digunakan perbandingan paling sederhana, maka bentuk di atas diubah menjadi:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-239851\" src=\"http:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/02\/fc988-sudut-istimewa-dalam-trigonometri15.png\" alt=\"\" width=\"80\" height=\"31\"><\/p>\n<p><span style=\"font-weight:400;\">Dengan mengetahui rasio sisi-sisi segitiga yang mengandung sudut istimewa 30<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> dan 60<\/span><sup><span style=\"font-weight:400;\">o<\/span><\/sup><span style=\"font-weight:400;\"> di atas, Quipperian bisa menentukan nilai dari sinus, kosinus, maupun tangen sudut tersebut tanpa perlu menggunakan kalkulator juga! Nilainya yang dapat diperoleh dari segitiga siku-siku inilah yang membuat sudut-sudut istimewa beserta variasinya seringkali digunakan di dalam soal trigonometri.<\/span><\/p>\n<p><span style=\"font-weight:400;\">Bagaimana, Quipperian? Apakah kamu sudah bisa memahami keistimewaan sudut-sudut yang dijelaskan di atas? Teori ini baru sebagian kecil yang bisa kamu pelajari mengenai sudut, segitiga, dan trigonometri. Masih banyak hal konseptual dan mendasar yang bisa kamu gali dari materi tersebut dari Quipper Video, <\/span><em><span style=\"font-weight:400;\">lho<\/span><\/em><span style=\"font-weight:400;\">! <\/span><\/p>\n<p><span style=\"font-weight:400;\">Terlebih, trigonometri merupakan salah satu materi yang dapat dipastikan masuk ke dalam soal SBMPTN TKA Matematika IPA setiap tahunnya. Jadi, tunggu apa lagi? Kalau Quipperian ingin sukses SBMPTN, berlangganan Quipper Video dengan cara klik <\/span><a href=\"http:\/\/bit.ly\/caradaftarquipper\"><strong><em>link<\/em><\/strong><strong> ini<\/strong><\/a><span style=\"font-weight:400;\"> sekarang, ya!<\/span><\/p>\n<p><strong>Sumber:<\/strong><\/p>\n<ul>\n<li style=\"font-weight:400;\"><a href=\"https:\/\/learn.quipper.com\/course\/5771f5e2bb7e02001100236f\/topic\/58624198a3587c000c002a52\/quiz\/attempt\/1\/question\/1\/lesson\/1\/chapter\/1\"><span style=\"font-weight:400;\">https:\/\/learn.quipper.com\/course\/5771f5e2bb7e02001100236f\/topic\/58624198a3587c000c002a52\/quiz\/attempt\/1\/question\/1\/lesson\/1\/chapter\/1<\/span><\/a><\/li>\n<li style=\"font-weight:400;\"><a href=\"https:\/\/www.khanacademy.org\/math\/trigonometry\/trigonometry-right-triangles\/trig-ratios-special-triangles\/a\/trig-ratios-of-special-triangles\"><span style=\"font-weight:400;\">https:\/\/www.khanacademy.org\/math\/trigonometry\/trigonometry-right-triangles\/trig-ratios-special-triangles\/a\/trig-ratios-of-special-triangles<\/span><\/a><\/li>\n<li style=\"font-weight:400;\"><a href=\"https:\/\/www.youtube.com\/watch?v=tSHitjFIjd8\"><span style=\"font-weight:400;\">https:\/\/www.youtube.com\/watch?v=tSHitjFIjd8<\/span><\/a><\/li>\n<li style=\"font-weight:400;\"><a href=\"https:\/\/www.youtube.com\/watch?v=Qwet4cIpnCM\"><span style=\"font-weight:400;\">https:\/\/www.youtube.com\/watch?v=Qwet4cIpnCM<\/span><\/a><\/li>\n<\/ul>\n<p><strong>Penulis: Laili Miftahur Rizqi<\/strong><\/p>\n<h1 class=\"mh-loop-title\" style=\"text-align:center;\"><a href=\"https:\/\/www.quipper.com\/id\/blog\/mapel\/matematika\/rumus-identitas-trigonometri\/\" rel=\"bookmark\">Menghitung Tinggi Pohon Menggunakan Rumus Identitas Trigonometri<\/a><\/h1>\n","protected":false},"excerpt":{"rendered":"<p>Ketika belajar matematika, terutama bab mengenai trigonometri, Quipperian pasti dikenalkan dengan istilah sudut istimewa. Besar derajat dari sudut-sudut istimewa tersebut, antara lain 30o, 45o,&hellip;<\/p>\n","protected":false},"author":99400369,"featured_media":240071,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_crdt_document":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[679384888,679384865],"tags":[],"ppma_author":[],"class_list":["post-239841","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mapel","category-matematika"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Seberapa Istimewa Sih Sudut Istimewa dalam Trigonometri? Simak Teorinya, Yuk!<\/title>\n<meta name=\"description\" content=\"Quipperian, yuk khatamin materi sudut istimewa dalam trigonometri ini biar Matematika kamu lancar. Dengan begitu, baik UN atau SBMPTN sudah pasti sukses!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.quipper.com\/id\/blog\/mapel\/matematika\/sudut-istimewa-dalam-trigonometri\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Seberapa Istimewa Sih Sudut Istimewa dalam Trigonometri? Simak Teorinya, Yuk!\" \/>\n<meta property=\"og:description\" content=\"Quipperian, yuk khatamin materi sudut istimewa dalam trigonometri ini biar Matematika kamu lancar. 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