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I say that CB is in a straight line with BD.
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T H E E L E M E N T S |
Book I Proposition 14 | |
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For with any straight line AB, and at the point B on it,
let the two straight lines CB, BD not lying on the same side
make the adjacent angles CBA, ABD equal to two right angles; I say that CB is in a straight line with BD. |
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