T H E E L E M E N T S	Book VI   Proposition 19
	Therefore     in the triangles ABG, DEF the sides about the equal angles are reciprocally proportional. But     those triangles which have one angle equal to one angle, and in which the sides about the equal angles are reciprocally proportional, are equal; [V.15] therefore     the triangle ABG is equal to the triangle DEF.
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