T H E E L E M E N T S |
Book VI Proposition 15 | |
Let ABC, ADE be equal triangles having one angle equal to one angle, namely the angle BAC equal to the angle DAE; I say that in the triangles ABC, ADE, the sides about the equal angles are reciprocally proportional, that is to say, that, as CA is to AD, so is EA to AB. |
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