T H E E L E M E N T S |
Book VI Proposition 20 | |
But, as CAB is to BAD, so is CA to AD, [VI.1] and, as EAD is to BAD, so is EA to AB. [VI.1] Therefore also, as CA is to AD, so is EA to AB. [V.11] Therefore in the triangles ABC, ADE the sides about the equal angles are reciprocally proportional. |
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