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సమాంతర చతుర్భుజం లో ఎదురెదురు కోణాలు సర్వ సమానం

Translated from original video Title - Proof Opposite Angles of Parallelogram Congruent URL -https://www.khanacademy.org/math/geometry/quadrilaterals-and-polygons/v/proof---opposite-angles-of-parallelogram-congruent