T H E E L E M E N T S |
Book VI Proposition 1 | |
Next, since the parallelogram EC is double of the triangle ABC, [I.41] and the parallelogram FC is double of the triangle ACE, while parts have the same ratio as the same multiples of them [V.15], therefore as the triangle ABC is to the triangle ACD, so is the parallelogram EC to the parallelogram FC. |
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