https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-triangle-theorems/v/congruent-triangle-proof-example 2021-02-16T16:08:13Z Geometry proof problem: midpoint Sal proves that a point is the midpoint of a segment using triangle congruence. Sal Khan video https://cdn.kastatic.org/googleusercontent/s8sT_SliX29E4evlShM07KVeJtebkUpN6bzKCscjA_0GNtbGmbNIXp21TU8T0sc6KUQhrA1-HVMgkZ4gvuRD-a9q6Q Geometry proof problem: midpoint Sal proves that a point is the midpoint of a segment using triangle congruence. https://cdn.kastatic.org/ka-youtube-converted/RFesGHsuFZw.mp4/RFesGHsuFZw.mp4 346 Proofs of general theorems https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-triangle-theorems/v/congruent-triangle-example-2 2021-02-16T16:08:13Z Geometry proof problem: congruent segments Sal proves that two pairs of segments are congruent using the ASA and AAS congruence criteria. Sal Khan video https://cdn.kastatic.org/googleusercontent/gjBsNz5QritV7Wf3FQXHNRnmxMfPRtiBI7XXOwQnaAQvxpZ446bpEoJulwDk8o7CVV4BfF2RXZAcbwhEJVm-vj0 Geometry proof problem: congruent segments Sal proves that two pairs of segments are congruent using the ASA and AAS congruence criteria. https://cdn.kastatic.org/ka-youtube-converted/Xc3oHzKXVh8.mp4/Xc3oHzKXVh8.mp4 734 Proofs of general theorems https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-triangle-theorems/v/problem-involving-angle-derived-from-square-and-circle 2021-02-16T16:08:13Z Geometry proof problem: squared circle Sal finds a missing angle using triangle congruence in a diagram that contains sector of a circle inscribed within a square. Sal Khan video https://cdn.kastatic.org/googleusercontent/Lqo62rRlsknq3ZdbG937adnqmmLM8B5KD3OBbZ4-qkJ_dtfZhtX4rtsB5_kRi6fdNY6rPgsK38waRGy-KqSFVHg Geometry proof problem: squared circle Sal finds a missing angle using triangle congruence in a diagram that contains sector of a circle inscribed within a square. https://cdn.kastatic.org/ka-youtube-converted/3n0LvI99-KM.mp4/3n0LvI99-KM.mp4 495 Proofs of general theorems https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-triangle-theorems/e/line-and-angle-proofs 2026-04-01T17:14:22.695166407Z Line and angle proofs Prove theorems about lines and angles using triangle congruence criteria and algebra. Justin Helps exercise