https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:triangles/x06d55bfa213a79fd:properties-of-triangles/v/proofs-concerning-isosceles-triangles-indian-accent 2025-06-04T10:04:13.13703146Z Proofs concerning isosceles triangles Lets proves that the base angles in isosceles triangles are congruent, and conversely, that triangles with congruent base angles are isosceles. He also proves that the perpendicular to the base of an isosceles triangle bisects it. Aakash Bagga video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Proofs concerning isosceles triangles Lets proves that the base angles in isosceles triangles are congruent, and conversely, that triangles with congruent base angles are isosceles. He also proves that the perpendicular to the base of an isosceles triangle bisects it. https://cdn.kastatic.org/ka-youtube-converted/SV5MpEfTYOg.mp4/SV5MpEfTYOg.mp4 543 Some properties of triangles https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-working-with-triangles/e/find-angles-in-isosceles-triangles 2026-04-01T18:54:25.495699557Z Find angles in isosceles triangles Find missing angles in isosceles triangles given just one angle. Ben Stenhaug exercise