T H E
E L E M E N T S

Book VI
Proposition 4

Let
ABC, DCE be equiangular triangles having the angle ABC equal to the angle DCE, the angle BAC to the angle CDE, and further the angle ACE to the angle CED;
I say that
in the triangles ACE, DCE the sides about the equal angles are proportional, and those are corresponding sides which subtend the equal angles.


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