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I say that the rectangle contained by AD, DC is equal to the square on DB.
Then DCA is either through the center or not through the center.
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T H E E L E M E N T S |
Book III Proposition 36 | |
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For let a point D be taken outside the circle ABC, and from D let the two straight
lines DCA, DB fall on the circle ABC; let DCA cut the circle ABC
and let BD touch it; I say that the rectangle contained by AD, DC is equal to the square on DB. Then DCA is either through the center or not through the center. |
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