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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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Some Thoughts playing with GSP -- no proof | Comment 1 of 2
Playing with Geometer's Sketchpad, I see it seems that the fill-in is "parallelogram".
  Posted by Charlie on 2018-01-25 10:31:54
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