Determine whether each piece of given information alone is sufficient to prove quadrilateral ABCD is parallelogram. Justify your
answer. Yes/No? Reason... opposite side congruent, opposite angles congruent, opposite sides parallel, consecutive angles are supplementary, diagonals bisect each other, one pair of parallel and congruent sides, not enough information? (look at the image)
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and you can simply solve that for "x"