T H E E L E M E N T S	Book III   Proposition 13
	Then, since     the point G is the center of the circle ABDC,     BG is equal to GD; therefore     BG is greater than HD; therefore BH is much greater than HD. Again, since     the point H is the center of the circle EBFD, BH is equal to HD; but it was also proved much greater than it: which is impossible. Therefore     a circle does not touch a circle internally at more points than one.
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