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Quadrilateral fill in the blank (Posted on 2018-01-25) Difficulty: 3 of 5
A quadrilateral is a _________ if and only if the sum of the squares of its sides is equal to the sum of the squares of its diagonals. Prove it.

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  Subject Author Date
A draft for solutionarmando2018-01-27 09:50:42
Some Thoughtsplaying with GSP -- no proofCharlie2018-01-25 10:31:54
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