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OpenStudy (anonymous):
To prove quadrilateral ABCD is a parallelogram, one must justify that
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OpenStudy (anonymous):
that ?
OpenStudy (kira_yamato):
The opposite sides are parallel
OpenStudy (king):
opposite sides are parallel, angles not equal to 90 degrees and opposite angles are equal
OpenStudy (anonymous):
Opposite sides are parallel. Opposite angles are congruent. Diagonals bisect each other. Sum of any two adjacent angles is supplementary.
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