T H E E L E M E N T S |
Book II Proposition 9 | |
Since the square on AE is double of the square on AC, and the square on EF double of the square on CD; therefore the squares on AE, EF are double of the squares on AC, CD. And the square on AF is equal to the squares on AE, EF, for the angle at AEF is right; [I.47] therefore the square on AF is double of the squares on AC, CD. |
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