SOLUTION: Which of the following conditions or set of conditions is sufficient for a parallelogram to be a square?

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Question 549542: Which of the following conditions or set of conditions is sufficient for a parallelogram to be a square?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
The only conditions required are that the parallelogram has four congruent sides (or equivalently, equal diagonals) and four right angles.