T H E E L E M E N T S	Book VI   Proposition 14
	But,     as AB is to FE,     so is DB to BE, [VI.1] and,     as BC is to FE,     so is GB to BF; [VI.1] therefore also,     as DB is to BE,     so is GB to BF. [V.11] Therefore     in the parallelograms AB, BC the sides about the equal angles are reciprocally proportional.
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