T H E E L E M E N T S |
Book I Proposition 47 | |
Now the parallelogram BDLM is double of the triangle ABD, for they have the same base BD and are in the same parallels BD, AL. [I.41] And the square GB is double of the triangle FBC, for they have the same base FB and are in the same parallels FB, GC. [I.41] [But the doubles of equals are equal to one another.] Therefore the parallelogram BL is also equal to the square GB. |
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