SOLUTION: How to prove a parallelogram is a rectangle?

SOLUTION: How to prove a parallelogram is a rectangle?

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Question 991588: How to prove a parallelogram is a rectangle?

Answer by ikleyn(52847) (Show Source): You can put this solution on YOUR website!
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Prove that at least one interior angle is the right angle.

Or prove that some two adjacent sides are perpendicular.

It is the same.

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