T H E E L E M E N T S	Book III   Proposition 10
	Then, since     in the circle ABC a straight line AC cuts a straight line BH into two equal parts and at right angles, the center of the circle ABC is on AC. [III.1, Por.] Again, since     in the same circle ABC a straight line NO cuts a straight line BG into equal parts and at right angles, the center of the circle ABC is on NO. [III.1, Por.]
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