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A geometry question-urgent !!! <span title="helllllllllppppppppppp!!!!!!?">helllllllllppppppppppp!!!...</span>

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Prove that the sum of squares of the sides of a parallelogram is equal to the sum of the squares of its diagonals.

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  1. The diagonal divides it into two triangles. To one of the triangles, apply the pythagorean theorem, and you are done.

    See reference for proof of Pythagorean theorem

    .


  2. x=y-2 squared
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