prove that opposite sides and opposite Angele of a parallelogram congruent
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Theorem: if a quadrilateral has 2 sets of opposite sides congruent, then it is a parallelogram. theorem: if a quadrilateral has 2 sets of opposite angles congruent, then it is a parallelogram. theorem: if a quadrilateral has consecutive angles which are supplementary, then it is a parallelogram.
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