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 DER. |
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