https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:week-3/x01cb2212e31ce997:triangles-and-their-properties/v/classifying-triangles_indian_accent 2025-06-05T06:01:43.515132284Z 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. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw 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/9TVBkPHA89Q.mp4/9TVBkPHA89Q.mp4 357 Triangles and their properties https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/v/scalene-isosceles-equilateral-from-angle 2021-06-30T20:49:33Z Classifying triangles by angles You say you can't categorize a triangle because you don't know the length of the sides. Guess what? If you know the size of the angles you can! Sal Khan video https://cdn.kastatic.org/googleusercontent/fJ0XSsqW77AbfVqQKX5qllzzpmxR7zSrqOT1yMUB-BnA2aqhu2wp63g1ugLQbX6ivpdMAKDZbOqDR_CE3xqQuLYF Classifying triangles by angles You say you can't categorize a triangle because you don't know the length of the sides. Guess what? If you know the size of the angles you can! https://cdn.kastatic.org/ka-youtube-converted/sZMezOCZr40.mp4/sZMezOCZr40.mp4 330 Triangles and their properties https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:week-3/x01cb2212e31ce997:triangles-and-their-properties/v/angles-in-a-triangle-sum-to-180-proof-indian-accent 2025-06-04T10:11:55.11792485Z Angles in a triangle sum to 180° proof The sum of the interior angle measures of a triangle always adds up to 180;. We can draw a line parallel to the base of any triangle through its third vertex. Then we use transversals, vertical angles, and corresponding angles to rearrange those angle measures into a straight line, proving that they must add up to 180. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Angles in a triangle sum to 180° proof The sum of the interior angle measures of a triangle always adds up to 180;. We can draw a line parallel to the base of any triangle through its third vertex. Then we use transversals, vertical angles, and corresponding angles to rearrange those angle measures into a straight line, proving that they must add up to 180. https://cdn.kastatic.org/ka-youtube-converted/-IR3SJfOjIc.mp4/-IR3SJfOjIc.mp4 247 Triangles and their 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 Triangles and their properties https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:week-3/x01cb2212e31ce997:triangles-and-their-properties/e/revision-triangle-and-its-properties-mh-class-6 2026-01-28T03:50:33.306290623Z Revision triangle and its properties Mh class 6 . Khan Academy exercise