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How do I find the values to make this quadrilateral a parallelogram?

How do I find the values to make this quadrilateral a parallelogram?-example-1
User Sukhjinder
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1 Prove that both pairs of opposite sides are parallel. 2 Prove that both pairs of opposite sides are congruent. 3 Prove that one pair of opposite sides is both congruent and parallel. 4 Prove that the diagonals bisect each other.
User Pedro Figueiredo
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