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Mathematics 19 Online
OpenStudy (anonymous):

How do I prove that a parallelogram is a rectangle?

OpenStudy (solomonzelman):

You can't prove that, because that is not always the case. More accurately, it is almost never the case.

OpenStudy (solomonzelman):

You can prove the other way around if you want to.

OpenStudy (solomonzelman):

|dw:1406653917494:dw| And NOT a rectangle.

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