T H E E L E M E N T S |
Book I Proposition 14 | |
But the angles CBA, ABD are also equal to two right angles; therefore the angles CBA, ABE are equal to the angles CBA, ABD. [Post.4 and C.N.1] Let the angle CBA be subtracted form each; therefore the remaining angle ABE is equal to the remaining angle ABD, [C.N.3] Therefore BE is not in a straight line with CB. |
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