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therefore the angles CEA, AED are equal to the angles AED, DEB. [Post.4 and C.N.1]
Let the angle AED be subtracted from each;
therefore
the remaining angle CEA is equal to the remaining angle DEB. [C.N.3]
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T H E E L E M E N T S |
Book I Proposition 15 | |
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But since each of the two pairs of angles the angles CEA, AED and AED, DEB was proved
equal to two right angles; therefore the angles CEA, AED are equal to the angles AED, DEB. [Post.4 and C.N.1] Let the angle AED be subtracted from each; therefore the remaining angle CEA is equal to the remaining angle DEB. [C.N.3] |
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