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let BE be in a straight line with CB.
Then, since
the straight line AB stands on the straight line CBE,
the angles CBA, ABE are equal to two right angles. [I.13]
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T H E E L E M E N T S |
Book I Proposition 14 | |
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For, if BD is not in a straight line with BC, let BE be in a straight line with CB. Then, since the straight line AB stands on the straight line CBE, the angles CBA, ABE are equal to two right angles. [I.13] |
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