Question

Prove that if one pair of opposite sides of a quadrilateral is equal and parallel, it is a parallelogram
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Answer 1

Answer:

Theorem 47: If both pairs of opposite angles of a quadrilateral are equal, then it is a parallelogram. ... Theorem 49: If one pair of opposite sides of a quadrilateral is both equal and parallel, then it is a parallelogram. Theorem 50: If the diagonals of a quadrilateral bisect each other, then it is a parallelogram.

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