Thread: rectangle law?

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i cant under why its call rectangle law?

Originally Posted by transgalactic

http://i33.tinypic.com/rqw8et.gif

i cant under why its call rectangle law?

In France it is called parallelogram law, because it states is that, in a parallelogram, the sum of the two squared lengths of the diagonals equals the sum of the four squared sidelengths.

(This parallelogram has vertices )

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