https://hi.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-parallelograms/v/proof-opposite-angles-of-parallelogram-congruent 2023-08-31T12:29:33.88551737Z उपपत्ति: समांतर चतुर्भुज के सम्मुख कोण (Proof: Opposite angles of a parallelogram) Sal proves that opposite angles of a parallelogram are congruent. Sal Khan video https://cdn.kastatic.org/googleusercontent/6y9cgS_Ed8ofB7a7kabkdW7h8oxf3miLKnWKrP1ga4Us7tv5pMbOwfCP37w9HztilyNNuQKK2C0J_Slsai2VzgTd1g उपपत्ति: समांतर चतुर्भुज के सम्मुख कोण (Proof: Opposite angles of a parallelogram) Sal proves that opposite angles of a parallelogram are congruent. https://cdn.kastatic.org/ka-youtube-converted/oIV1zM8qlpk.mp4/oIV1zM8qlpk.mp4 248 चतुर्भुज (Quadrilaterals) https://hi.khanacademy.org/math/revision-up-math-class-7/xad74f3b46242b79b:week-3-revision-up-math-class-7/xad74f3b46242b79b:quadrilaterals-revision-up-math-class-7/e/revision-quadrilaterals-up-math-class-7 2025-01-28T06:50:44.363194451Z पुनः अवलोकन चतुर्भुज (Quadrilaterals) चतुर्भुजों के अभ्यास हेतु प्रश्न Satya Swaroop exercise