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S		 Book II   Proposition 7
But
    twice the rectangle AB, BC is also double of AF for BF is equal to BC;
therefore
    the gnomon KLM and the square CF are equal to twice the rectangle AB, BC.

Let
    DG, which is the square on AC, be added to each;
therefore
    the gnomon KLM and the squares BG, GD
are equal to
    twice the rectangle contained by AB, BC and the square on AC.
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