T H E E L E M E N T S	Book II   Proposition 9
	Again, since EG is equal to GF,     the square on EG is also equal to the square on GF; therefore     the squares on EG, GF are double of the square on GF. But     the square on EF is equal to the squares EG, GF, therefore     the square on EF is double of the square on GF. But     GF is equal to CD; [I.34] therefore     the square on EF is double of the square on CD.
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