https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/v/scalene-isosceles-equilateral-acute-right-obtuse 2023-07-24T13:48:13.07161686Z Classifying triangles The video explores how triangles are classified based on their sides and angles. It introduces the terms scalene, isosceles, and equilateral for side lengths, and acute, right, and obtuse for angles. It emphasizes that triangles can be categorized in multiple ways based on these characteristics. Sal Khan video https://cdn.kastatic.org/googleusercontent/wmcE1ICNQ2GKhtp6LRNQ8JmJgM5inf2NFAG6LfgOiBmBCSF3BfAUk2xVCtag-1XktR-C59FTrWFhayWGscT_vDQy Classifying triangles The video explores how triangles are classified based on their sides and angles. It introduces the terms scalene, isosceles, and equilateral for side lengths, and acute, right, and obtuse for angles. It emphasizes that triangles can be categorized in multiple ways based on these characteristics. https://cdn.kastatic.org/ka-youtube-converted/D5lZ3thuEeA.mp4/D5lZ3thuEeA.mp4 360 Triangle and its properties https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:week-3/x01cb2212e31ce997:triangles-and-their-properties/v/triangle-inequality-theorem-indian-accent 2025-06-05T06:01:43.515132284Z Triangle inequality theorem Intuition behind the triangle inequality theorem Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Triangle inequality theorem Intuition behind the triangle inequality theorem https://cdn.kastatic.org/ka-youtube-converted/Y7Nj2hbq2Nw.mp4/Y7Nj2hbq2Nw.mp4 305 Triangle and its properties https://www.khanacademy.org/math/class-7-tg/x476671d9fb9d8978:triangle-and-its-properties/x476671d9fb9d8978:relationship-between-the-sides-of-a-triangle/v/difference-between-of-two-sides-of-a-triangle 2025-10-06T14:00:44.591197305Z Difference between of two sides of a triangle "Why can’t any three lengths form a triangle? In this video, we explore the Triangle Inequality Property through a hands-on activity that reveals a surprising truth: the difference between any two sides of a triangle is always less than the third side. We then uncover the deeper rationale behind the property and see how it ensures the sides can actually meet to form a closed shape. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now!Unit link 00:00 An activity to understand inequality property of triangles 04:00 Logic behind the property Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Khan Academy Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Difference between of two sides of a triangle "Why can’t any three lengths form a triangle? In this video, we explore the Triangle Inequality Property through a hands-on activity that reveals a surprising truth: the difference between any two sides of a triangle is always less than the third side. We then uncover the deeper rationale behind the property and see how it ensures the sides can actually meet to form a closed shape. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now!Unit link 00:00 An activity to understand inequality property of triangles 04:00 Logic behind the property Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/fj0Lf2hH76s.mp4/fj0Lf2hH76s.mp4 340 Triangle and its properties https://www.khanacademy.org/math/revision-term-1-mh-math-class-8/x0c43044bb5624863:week-2/x0c43044bb5624863:altitudes-and-median-of-triangles/v/what-are-altitudes-of-triangle 2024-05-28T09:47:20.658952794Z What are altitudes of triangle In this video we discuss what is an altitude of a triangle and how we can draw/identitfy different altitudes of the triangle Devashish Phadnis video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw What are altitudes of triangle In this video we discuss what is an altitude of a triangle and how we can draw/identitfy different altitudes of the triangle https://cdn.kastatic.org/ka-youtube-converted/X2v5aCK5ZoI.mp4/X2v5aCK5ZoI.mp4 206 Triangle and its properties https://www.khanacademy.org/districts-courses/geometry-scps-pilot-textbook/x398e4b4a0a333d18:properties-and-attributes-of-triangles/x398e4b4a0a333d18:medians-and-altitudes-of-triangles/v/intro-to-medians-of-a-triangle-class-7-india-math-khan-academy 2021-07-02T09:35:35Z Intro to medians of a triangle Let's get introduced to medians of a triangle and learn what centroids are. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/t7OPUsgVEIuYj41K54WrfklJHYd53UanJSJy1-buyZqs7XSIOtz2ZajmyOuocKoTtELjjxKf0bqFxqSomwA-11ZNuA Intro to medians of a triangle Let's get introduced to medians of a triangle and learn what centroids are. https://cdn.kastatic.org/ka-youtube-converted/cr92Xwb4CoA.mp4/cr92Xwb4CoA.mp4 328 Triangle and its properties https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:a-tale-of-three-intersecting-lines/x063f95a40c290960:properties-of-triangles-part-2/v/worked-example-triangle-angles-intersecting-lines_indian_accent 2025-06-11T12:53:03.642274817Z Worked example: Triangle angles (intersecting lines) Learn how to find unknown angles in triangles and intersecting lines. We use concepts like supplementary angles (angles that add up to 180°), vertical angles (opposite angles made by two crossing lines), and exterior angles (angles outside a triangle). There are lots of ways to think about this problem. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Worked example: Triangle angles (intersecting lines) Learn how to find unknown angles in triangles and intersecting lines. We use concepts like supplementary angles (angles that add up to 180°), vertical angles (opposite angles made by two crossing lines), and exterior angles (angles outside a triangle). There are lots of ways to think about this problem. https://cdn.kastatic.org/ka-youtube-converted/gcsBX7aFb2k.mp4/gcsBX7aFb2k.mp4 297 Triangle and its properties https://www.khanacademy.org/math/revision-term-1-mh-math-class-7/x0bdc8a5f9d8ec377:week-2/x0bdc8a5f9d8ec377:angles-and-pairs-of-angles/v/triangle-exterior-angle-example-indian-accent 2025-06-04T10:04:13.13703146Z Triangle exterior angle example An exterior angle is formed outside a triangle by extending a side. Its measure is equal to the sum of the two non-adjacent interior angle measures, thanks to the fact that all angle measures in a triangle add up to 180 degrees. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Triangle exterior angle example An exterior angle is formed outside a triangle by extending a side. Its measure is equal to the sum of the two non-adjacent interior angle measures, thanks to the fact that all angle measures in a triangle add up to 180 degrees. https://cdn.kastatic.org/ka-youtube-converted/g2bHflif-VI.mp4/g2bHflif-VI.mp4 349 Triangle and its properties https://www.khanacademy.org/math/revision-tg-math-class-7/x49a72ea63977ab7d:week-1/x49a72ea63977ab7d:triangle-and-its-properties/e/revision-triangle-and-its-properties-tg-class-7 2026-02-18T21:20:35.275198076Z Revision triangle and its properties TG class 7 . Khan Academy exercise