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OpenStudy (anonymous):
in parallelogram ABCD, D is right angle. is ABCD a rectangle? (picture) https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-frc3/1011512_630263826993556_231279011_n.jpg plz give me the best answer.
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OpenStudy (ivettef365):
couldn't it be a square ??
OpenStudy (ivettef365):
property of parallelogram opposite angles are congruent, so we know that if one angle is 90, then all the others needs to be 90, could be a rectangle
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