https://www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-special-right-triangles/v/30-60-90-triangle-side-ratios-proof 2021-02-16T16:08:14Z Special right triangles proof (part 1) Learn how to prove the ratios between the sides of a 30-60-90 triangle. Sal Khan video https://cdn.kastatic.org/googleusercontent/6aIMRLIsEffQv2yhgkdHfU9w-R7CxJt7PcuzlcdjECYRUZXtnFGC3eMhH4OO2bQaA23hRtPYNSBJMuvgF92exlw Special right triangles proof (part 1) Learn how to prove the ratios between the sides of a 30-60-90 triangle. https://cdn.kastatic.org/ka-youtube-converted/SFL4stapeUs.mp4/SFL4stapeUs.mp4 419 Special right triangles https://www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-special-right-triangles/v/45-45-90-triangle-side-ratios 2021-02-16T16:08:14Z Special right triangles proof (part 2) Showing the ratios of the sides of a 45-45-90 triangle are 1:1:sqrt(2) Sal Khan video https://cdn.kastatic.org/googleusercontent/xaqSAHyK7nVE_PZ207bMN8fPJCbjrRYoX7UoreaHnPyeTYOhRQ7gJqodfMRDMjWazhYn3zH8HoFX4nbAwl2tyNpU Special right triangles proof (part 2) Showing the ratios of the sides of a 45-45-90 triangle are 1:1:sqrt(2) https://cdn.kastatic.org/ka-youtube-converted/McINBOFCGH8.mp4/McINBOFCGH8.mp4 342 Special right triangles https://www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-special-right-triangles/e/pythagorean_theorem_2 2025-12-30T07:05:15.972746521Z Special right triangles Use the Pythagorean theorem to discover patterns in 30°-60°-90° and 45°-45°-90° triangles. Ben Alpert exercise https://www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-special-right-triangles/v/30-60-90-triangle-example-problem 2021-03-30T19:55:56Z 30-60-90 triangle example problem Using what we know about 30-60-90 triangles to solve what at first seems to be a challenging problem Sal Khan video https://cdn.kastatic.org/googleusercontent/UaiP-JD6_uAgur8B076pwq4uGj1vDwaVMIDqNcAu68jkBzI7Z5OnGvknFgaKNZVuoDtt6QGLOHJxqhMxehjsMlWV 30-60-90 triangle example problem Using what we know about 30-60-90 triangles to solve what at first seems to be a challenging problem https://cdn.kastatic.org/ka-youtube-converted/dgHksfBFbjk.mp4/dgHksfBFbjk.mp4 400 Special right triangles https://www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-special-right-triangles/v/area-of-a-regular-hexagon 2021-02-16T16:08:12Z Area of a regular hexagon Using what we know about triangles to find the area of a regular hexagon Sal Khan video https://cdn.kastatic.org/googleusercontent/jDGqIhIyeMYtObahppz93cKtcrEAxiNtedojwgm1XVCbSE1fPKeEOgxbVr1EDuLizb68lR16f-4ffJ0BE-xtG1rxIQ Area of a regular hexagon Using what we know about triangles to find the area of a regular hexagon https://cdn.kastatic.org/ka-youtube-converted/LrxZMdQ6tiw.mp4/LrxZMdQ6tiw.mp4 471 Special right triangles https://www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-special-right-triangles/a/special-right-triangles-review 2025-05-08T14:45:44.86785259Z Special right triangles review Learn shortcut ratios for the side lengths of two common right triangles: 45°-45°-90° and 30°-60°-90° triangles. The ratios come straight from the Pythagorean theorem. article