https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/advanced-area-with-triangles/v/area-of-an-equilateral-triangle 2020-06-23T07:22:42Z Area of equilateral triangle Finding the formula for the area of an equilateral triangle with side s Sal Khan video https://cdn.kastatic.org/googleusercontent/lUjD7cst915kQlqm8ES0Pd4Axdx7mUlfpkMYlAY7shaS70Qu9wkHMOVPFOsPUAOWvG03FlM6z9t0gb1_VnV_WYmWDA Area of equilateral triangle Finding the formula for the area of an equilateral triangle with side s https://cdn.kastatic.org/ka-youtube-converted/UKQ65tiIQ6o.mp4/UKQ65tiIQ6o.mp4 222 Regular polygon area 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 Regular polygon area https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:measurement-of-two-dimensional-figures/x790e3ac3e338c450:regular-polygons/v/area-of-regular-polygon-given-side-length 2025-05-27T22:28:08.541612202Z Area of regular polygon given side length Given the side length of a regular polygon, find its area. The area of a regular polygon is 1/2 * (apothem length) * perimeter. We can split the polygon into congruent right triangles. Then trigonometric ratios help us find the apothem length based on the side length and angle measures. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Area of regular polygon given side length Given the side length of a regular polygon, find its area. The area of a regular polygon is 1/2 * (apothem length) * perimeter. We can split the polygon into congruent right triangles. Then trigonometric ratios help us find the apothem length based on the side length and angle measures. https://cdn.kastatic.org/ka-youtube-converted/a6dbxqVWOf4.mp4/a6dbxqVWOf4.mp4 345 Regular polygon area https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:measurement-of-two-dimensional-figures/x790e3ac3e338c450:regular-polygons/v/area-of-regular-polygon-given-radius 2025-05-27T22:28:08.541612202Z Area of regular polygon given radius Given the radius of a regular polygon, find its area. The area of a regular polygon is 1/2 * (apothem length) * perimeter. We can split the polygon into congruent right triangles. Then trigonometric ratios help us find the apothem length and side length based on the radius length and angle measures. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Area of regular polygon given radius Given the radius of a regular polygon, find its area. The area of a regular polygon is 1/2 * (apothem length) * perimeter. We can split the polygon into congruent right triangles. Then trigonometric ratios help us find the apothem length and side length based on the radius length and angle measures. https://cdn.kastatic.org/ka-youtube-converted/9LlgG6l5eXU.mp4/9LlgG6l5eXU.mp4 333 Regular polygon area https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:measurement-of-two-dimensional-figures/x790e3ac3e338c450:regular-polygons/e/area-regular-polygons 2026-05-26T15:50:39.591853861Z Area of regular polygons Given the number of sides and the radius, apothem, or side length, find the area of a regular polygon. Charlie Auen exercise https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/advanced-area-with-triangles/v/area-of-shaded-region-made-from-equilateral-triangles 2020-06-23T07:22:41Z Area of equilateral triangle (advanced) Sal finds a shaded area defined by two equilateral triangles whose side lengths are given. Sal Khan video https://cdn.kastatic.org/googleusercontent/fm1EQ8KamWuuSanpg49OA5J-Auovj_av53J5E2CVuPvlruSYbiXZ1-dvQLXEIQQJ_qt7QnGsBHCPS5agk7BRZGxE Area of equilateral triangle (advanced) Sal finds a shaded area defined by two equilateral triangles whose side lengths are given. https://cdn.kastatic.org/ka-youtube-converted/QVxqgxVtKbs.mp4/QVxqgxVtKbs.mp4 337 Regular polygon area