T H E E L E M E N T S	Book II   Proposition 9
	Now, since AC is equal to CE,     the square on AC is also equal to the square on CE; therefore     the squares on AC, CE are double of the square on AC. But     the square on EA is equal to the squares AC, CE, for the angle ACE is right; [I.47] therefore     the square on EA is double of the square on AC.
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