In order to continue enjoying our site, we ask that you confirm your identity as a human. Thank you very much for your cooperation. There is a special relationship among the measures of the sides of a 30°−60°−90° triangle. A 30°−60°−90° triangle is commonly encountered right triangle whose sides are in the proportion 1:3:2. The measures of the sides are x, x3, and 2x.In a 30°−60°−90° triangle, the length of the hypotenuse is twice the length of the shorter leg, and the length of the longer leg is 3 times the length of the shorter leg. To see why this is so, note that by the Converse of the Pythagorean Theorem, these values make the triangle a right triangle. x2+(x3)2=x2+3x2=4x2=(2x)2 {"appState":{"pageLoadApiCallsStatus":true},"articleState":{"article":{"headers":{"creationTime":"2016-03-26T15:13:15+00:00","modifiedTime":"2022-08-08T17:50:36+00:00","timestamp":"2022-09-14T18:19:52+00:00"},"data":{"breadcrumbs":[{"name":"Academics & The Arts","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33662"},"slug":"academics-the-arts","categoryId":33662},{"name":"Math","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33720"},"slug":"math","categoryId":33720},{"name":"Pre-Calculus","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33727"},"slug":"pre-calculus","categoryId":33727}],"title":"A Quick Guide to the 30-60-90 Triangle","strippedTitle":"a quick guide to the 30-60-90 triangle","slug":"quick-guide-to-the-30-60-90-degree-triangle","canonicalUrl":"","seo":{"metaDescription":"If you know any one side of a 30-60-90 triangle, you can find the other two. Each of these triangles have many things in common.","noIndex":0,"noFollow":0},"content":"The 30-60-90 triangle is shaped like half of an equilateral triangle, cut straight down the middle along its altitude. It has angles of 30 degrees, 60 degrees, and 90 degrees, thus, its name! In any 30-60-90 triangle, you see the following: The shortest leg is across from the 30-degree angle, the length of the hypotenuse is always double the length of the shortest leg, and you can find the length of the long leg by multiplying the short leg by the square root of 3.\r\n<p class=\"Tip\">The hypotenuse is the longest side in a right triangle, which is different from the long leg. The long leg is the leg opposite the 60-degree angle.</p>\r\nTwo of the most common right triangles are 30-60-90 and the <a href=\"https://www.dummies.com/article/academics-the-arts/math/pre-calculus/how-to-work-with-45-45-90-degree-triangles-167436/\" target=\"_blank\" rel=\"noopener\">45-45-90-degree triangles</a>. All 30-60-90 triangles have sides with the same basic ratio. If you look at the 30–60–90-degree triangle in <a href=\"https://www.dummies.com/article/academics-the-arts/math/trigonometry/defining-the-radian-in-trigonometry-199411/\" target=\"_blank\" rel=\"noopener\">radians</a>, it translates to the following:\r\n\r\n<img src=\"https://sg.cdnki.com/how-do-you-find-the-sides-of-a-30-60-90-triangle-when-given-the-hypotenuse---aHR0cHM6Ly93d3cuZHVtbWllcy5jb20vd3AtY29udGVudC91cGxvYWRzLzM2OTU3OS5pbWFnZTAucG5n.webp\" alt=\"30, 60, and 90 degrees expressed in radians.\" width=\"73\" height=\"37\" />\r\n\r\nThe figure illustrates the ratio of the sides for the 30-60-90-degree triangle.\r\n<div class=\"imageBlock\" style=\"width: 400px;\">\r\n\r\n[caption id=\"\" align=\"alignnone\" width=\"400\"]<img src=\"https://sg.cdnki.com/how-do-you-find-the-sides-of-a-30-60-90-triangle-when-given-the-hypotenuse---aHR0cHM6Ly93d3cuZHVtbWllcy5jb20vd3AtY29udGVudC91cGxvYWRzLzM2OTU4MC5pbWFnZTEuanBn.webp\" alt=\"A 30-60-90-degree right triangle.\" width=\"400\" height=\"257\" /> A 30-60-90-degree right triangle[/caption]\r\n\r\n<div class=\"imageCaption\"></div>\r\n</div>\r\nIf you know one side of a 30-60-90 triangle, you can find the other two by using shortcuts. Here are the three situations you come across when doing these calculations:\r\n<ul class=\"level-one\">\r\n \t<li>\r\n<p class=\"first-para\"><b>Type 1: You know the short leg (the side across from the 30-degree angle). </b>Double its length to find the hypotenuse. You can multiply the short side by the square root of 3 to find the long leg.</p>\r\n</li>\r\n \t<li>\r\n<p class=\"first-para\"><b>Type 2: You know the hypotenuse. </b>Divide the hypotenuse by 2 to find the short side. Multiply this answer by the square root of 3 to find the long leg.</p>\r\n</li>\r\n \t<li>\r\n<p class=\"first-para\"><b>Type 3: You know the long leg (the side across from the 60-degree angle).</b> Divide this side by the square root of 3 to find the short side. Double that figure to find the hypotenuse.</p>\r\n\r\n<div class=\"imageBlock\" style=\"width: 400px;\">\r\n\r\n[caption id=\"\" align=\"alignnone\" width=\"400\"]<img src=\"https://sg.cdnki.com/how-do-you-find-the-sides-of-a-30-60-90-triangle-when-given-the-hypotenuse---aHR0cHM6Ly93d3cuZHVtbWllcy5jb20vd3AtY29udGVudC91cGxvYWRzLzM2OTU4MS5pbWFnZTIuanBn.webp\" alt=\"Finding the other sides of a 30-60-90 triangle when you know the hypotenuse.\" width=\"400\" height=\"249\" /> Finding the other sides of a 30-60-90 triangle when you know the hypotenuse[/caption]\r\n\r\n<div class=\"imageCaption\"></div>\r\n</div></li>\r\n</ul>\r\nIn the triangle TRI in this figure, the hypotenuse is 14 inches long; how long are the other sides?\r\n\r\nBecause you have the hypotenuse TR = 14, you can divide by 2 to get the short side: RI = 7. Now you multiply this length by the square root of 3 to get the long side:\r\n\r\n<img src=\"https://sg.cdnki.com/how-do-you-find-the-sides-of-a-30-60-90-triangle-when-given-the-hypotenuse---aHR0cHM6Ly93d3cuZHVtbWllcy5jb20vd3AtY29udGVudC91cGxvYWRzLzM2OTU4Mi5pbWFnZTMucG5n.webp\" alt=\"The long side of a 30-60-90-degree triangle.\" width=\"65\" height=\"23\" />","description":"The 30-60-90 triangle is shaped like half of an equilateral triangle, cut straight down the middle along its altitude. It has angles of 30 degrees, 60 degrees, and 90 degrees, thus, its name! In any 30-60-90 triangle, you see the following: The shortest leg is across from the 30-degree angle, the length of the hypotenuse is always double the length of the shortest leg, and you can find the length of the long leg by multiplying the short leg by the square root of 3.\r\n<p class=\"Tip\">The hypotenuse is the longest side in a right triangle, which is different from the long leg. The long leg is the leg opposite the 60-degree angle.</p>\r\nTwo of the most common right triangles are 30-60-90 and the <a href=\"https://www.dummies.com/article/academics-the-arts/math/pre-calculus/how-to-work-with-45-45-90-degree-triangles-167436/\" target=\"_blank\" rel=\"noopener\">45-45-90-degree triangles</a>. All 30-60-90 triangles have sides with the same basic ratio. If you look at the 30–60–90-degree triangle in <a href=\"https://www.dummies.com/article/academics-the-arts/math/trigonometry/defining-the-radian-in-trigonometry-199411/\" target=\"_blank\" rel=\"noopener\">radians</a>, it translates to the following:\r\n\r\n<img src=\"https://www.dummies.com/wp-content/uploads/369579.image0.png\" alt=\"30, 60, and 90 degrees expressed in radians.\" width=\"73\" height=\"37\" />\r\n\r\nThe figure illustrates the ratio of the sides for the 30-60-90-degree triangle.\r\n<div class=\"imageBlock\" style=\"width: 400px;\">\r\n\r\n[caption id=\"\" align=\"alignnone\" width=\"400\"]<img src=\"https://www.dummies.com/wp-content/uploads/369580.image1.jpg\" alt=\"A 30-60-90-degree right triangle.\" width=\"400\" height=\"257\" /> A 30-60-90-degree right triangle[/caption]\r\n\r\n<div class=\"imageCaption\"></div>\r\n</div>\r\nIf you know one side of a 30-60-90 triangle, you can find the other two by using shortcuts. Here are the three situations you come across when doing these calculations:\r\n<ul class=\"level-one\">\r\n \t<li>\r\n<p class=\"first-para\"><b>Type 1: You know the short leg (the side across from the 30-degree angle). </b>Double its length to find the hypotenuse. You can multiply the short side by the square root of 3 to find the long leg.</p>\r\n</li>\r\n \t<li>\r\n<p class=\"first-para\"><b>Type 2: You know the hypotenuse. </b>Divide the hypotenuse by 2 to find the short side. Multiply this answer by the square root of 3 to find the long leg.</p>\r\n</li>\r\n \t<li>\r\n<p class=\"first-para\"><b>Type 3: You know the long leg (the side across from the 60-degree angle).</b> Divide this side by the square root of 3 to find the short side. Double that figure to find the hypotenuse.</p>\r\n\r\n<div class=\"imageBlock\" style=\"width: 400px;\">\r\n\r\n[caption id=\"\" align=\"alignnone\" width=\"400\"]<img src=\"https://www.dummies.com/wp-content/uploads/369581.image2.jpg\" alt=\"Finding the other sides of a 30-60-90 triangle when you know the hypotenuse.\" width=\"400\" height=\"249\" /> Finding the other sides of a 30-60-90 triangle when you know the hypotenuse[/caption]\r\n\r\n<div class=\"imageCaption\"></div>\r\n</div></li>\r\n</ul>\r\nIn the triangle TRI in this figure, the hypotenuse is 14 inches long; how long are the other sides?\r\n\r\nBecause you have the hypotenuse TR = 14, you can divide by 2 to get the short side: RI = 7. Now you multiply this length by the square root of 3 to get the long side:\r\n\r\n<img src=\"https://www.dummies.com/wp-content/uploads/369582.image3.png\" alt=\"The long side of a 30-60-90-degree triangle.\" width=\"65\" height=\"23\" />","blurb":"","authors":[{"authorId":8985,"name":"Mary Jane Sterling","slug":"mary-jane-sterling","description":" <p><b>Mary Jane Sterling</b> is the author of <i>Algebra I For Dummies, Algebra Workbook For Dummies,</i> and many other <i>For Dummies</i> books. She taught at Bradley University in Peoria, Illinois for more than 30 years, teaching algebra, business calculus, geometry, and finite mathematics. ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/8985"}}],"primaryCategoryTaxonomy":{"categoryId":33727,"title":"Pre-Calculus","slug":"pre-calculus","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33727"}},"secondaryCategoryTaxonomy":{"categoryId":0,"title":null,"slug":null,"_links":null},"tertiaryCategoryTaxonomy":{"categoryId":0,"title":null,"slug":null,"_links":null},"trendingArticles":null,"inThisArticle":[],"relatedArticles":{"fromBook":[{"articleId":260218,"title":"Special Function Types and Their Graphs","slug":"special-function-types-and-their-graphs","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/260218"}},{"articleId":260215,"title":"The Differences between Pre-Calculus and Calculus","slug":"the-differences-between-pre-calculus-and-calculus","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/260215"}},{"articleId":260207,"title":"10 Polar Graphs","slug":"10-polar-graphs","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/260207"}},{"articleId":260183,"title":"Pre-Calculus: 10 Habits to Adjust before Calculus","slug":"pre-calculus-10-habits-to-adjust-before-calculus","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/260183"}},{"articleId":208308,"title":"Pre-Calculus For Dummies Cheat Sheet","slug":"pre-calculus-for-dummies-cheat-sheet","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/208308"}}],"fromCategory":[{"articleId":262884,"title":"10 Pre-Calculus Missteps to Avoid","slug":"10-pre-calculus-missteps-to-avoid","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/262884"}},{"articleId":262851,"title":"Pre-Calculus Review of Real Numbers","slug":"pre-calculus-review-of-real-numbers","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/262851"}},{"articleId":262837,"title":"Fundamentals of Pre-Calculus","slug":"fundamentals-of-pre-calculus","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/262837"}},{"articleId":262652,"title":"Complex Numbers and Polar Coordinates","slug":"complex-numbers-and-polar-coordinates","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/262652"}},{"articleId":260218,"title":"Special Function Types and Their Graphs","slug":"special-function-types-and-their-graphs","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/260218"}}]},"hasRelatedBookFromSearch":false,"relatedBook":{"bookId":282496,"slug":"pre-calculus-for-dummies-3rd-edition","isbn":"9781119508779","categoryList":["academics-the-arts","math","pre-calculus"],"amazon":{"default":"https://www.amazon.com/gp/product/1119508770/ref=as_li_tl?ie=UTF8&tag=wiley01-20","ca":"https://www.amazon.ca/gp/product/1119508770/ref=as_li_tl?ie=UTF8&tag=wiley01-20","indigo_ca":"http://www.tkqlhce.com/click-9208661-13710633?url=https://www.chapters.indigo.ca/en-ca/books/product/1119508770-item.html&cjsku=978111945484","gb":"https://www.amazon.co.uk/gp/product/1119508770/ref=as_li_tl?ie=UTF8&tag=wiley01-20","de":"https://www.amazon.de/gp/product/1119508770/ref=as_li_tl?ie=UTF8&tag=wiley01-20"},"image":{"src":"https://www.dummies.com/wp-content/uploads/pre-calculus-for-dummies-3rd-edition-cover-9781119508779-203x255.jpg","width":203,"height":255},"title":"Pre-Calculus For Dummies","testBankPinActivationLink":"","bookOutOfPrint":false,"authorsInfo":"<p><b data-author-id=\"8985\">Mary Jane Sterling</b> aught algebra, business calculus, geometry, and finite mathematics at Bradley University in Peoria, Illinois for more than 30 years. She is the author of several <i>For Dummies books,</i> including <i>Algebra Workbook For Dummies, Algebra II For Dummies,</i> and <i>Algebra II Workbook For Dummies.</i> </p>","authors":[{"authorId":8985,"name":"Mary Jane Sterling","slug":"mary-jane-sterling","description":" <p><b>Mary Jane Sterling</b> is the author of <i>Algebra I For Dummies, Algebra Workbook For Dummies,</i> and many other <i>For Dummies</i> books. She taught at Bradley University in Peoria, Illinois for more than 30 years, teaching algebra, business calculus, geometry, and finite mathematics. 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The hypotenuse is the longest side in a right triangle, which is different from the long leg. The long leg is the leg opposite the 60-degree angle. The figure illustrates the ratio of the sides for the 30-60-90-degree triangle. A 30-60-90-degree right triangle If you know one side of a 30-60-90 triangle, you can find the other two by using shortcuts. Here are the three situations you come across when doing these calculations:
Because you have the hypotenuse TR = 14, you can divide by 2 to get the short side: RI = 7. Now you multiply this length by the square root of 3 to get the long side: |