Question

a quadrilateral is parallelogram if a pair of opposite sides is equal and parallel.
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Answer 1

Answer:

THEOREM: If a quadrilateral is a parallelogram, it has 2 sets of opposite angles congruent. ... THEOREM: If a quadrilateral has diagonals which bisect each other, then it is a parallelogram. * THEOREM: If a quadrilateral has one set of opposite sides which are both congruent and parallel, then it is a parallelogram.

Step-by-step explanation: