perplexus.info :: Shapes : Quadrilateral fill in the blank

Quadrilateral fill in the blank (Posted on 2018-01-25)

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.

No Solution Yet Submitted by Jer

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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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