T H E E L E M E N T S |
Book II Proposition 13 | |
But the square on AB is equal to the squares on BD, DA, for the angle at D is right; [I.47] and the square on AC is equal to the squares on AD, DC; therefore the squares on AB, BC are equal to the square on AC and twice the rectangle CB, BD, so that the square on AC alone is less than the squares on AB, BC by twice the rectangle contained by CB, BD. Being what it was required to prove. |
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