Question

What is the condition for proving parallelogram​

Answer 1

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If both pairs of opposite angles of a quadrilateral are congruent, then it's a parallelogram (converse of a property). If the diagonals of a quadrilateral bisect each other, then it's a parallelogram (converse of a property).

Answer 2

opposites sides should be parallel

opposites sides should congruent

opposites angles are supplmentary