T H E E L E M E N T S |
Book VI Proposition 20 | |
Since then ABE, FGL are two triangles having one angle equal to one angle and the sides about the equal angles proportional, therefore the triangle ABE is equiangular with the triangle FGL; [V1.6] so that so that it is also similar; [V1.4 and VI.Def.1] therefore the angle ABE is equal to the angle FGL. |
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