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Math Help - rectangle law?

  1. #1
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    rectangle law?

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

    i cant under why its call rectangle law?
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  2. #2
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    Quote Originally Posted by transgalactic View Post
    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 0,f,f+g,g)
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  3. #3
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    mersi boku
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