T H E E L E M E N T S |
Book VI Proposition 19 | |
Let ABC, DEF be similar triangles having the angle at B equal to the angle at E, and such that as AB is to BC, so is DE to EF, so that BC corresponds to EF. [V. Def.11] I say that the triangle ABC has to the triangle DEF a ratio duplicate of that which BC has to EF. |
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