T H E E L E M E N T S	Book VI   Proposition 32
	And, since ABC, DCE are two triangles having     one angle, the angle at A equal to one angle, the angle at D, and     the sides about the equal angles proportional, so that     as BA is to AC, so is CE toDE, therefore     the triangle ABC is equiangular with the triangle DCE; [VI.6] therefore     the angle ABC is equal to the angle DEC.
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