T H E E L E M E N T S |
Book I Proposition 48 | |
But the square on DC is equal to the squares on DA, AC, for the angle DAC is right; [I.47] and the square on BC is equal to the squares on BA, AC, for this is the hypothesis; therefore the square on DC is equal to the square on BC, so that ths side DC is also equal to the side BC. |
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