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Which counterexample shows that the conjecture "Every parallelogram is also a rectangle" is false?
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4 votes
Which counterexample shows that the conjecture "Every parallelogram is also a rectangle" is false?

User Khoa Le
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2 Answers

4 votes
Yep that'd be false since they are also rectangles
User TorosFanny
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7.7k points
3 votes
A parallelogram without four right angles would prove that to be false.
User Malcolm Murdoch
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7.2k points
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