T H E E L E M E N T S |
Book VI Proposition 14 | |
Let AB, BC be equal and equiangular parallelograms having the angles at B equal, and let DB,BE be placed in a straight line; therefore FB,BG are also in a straight line. [I.14] I say that, in AB, BC, the sides about the equal angles are reciprocally proportional, that is to say, that, as DB is to BE, so is GB to BF. |
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