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the angle ACD was also proved equal to the angle BAC;
therefore
the whole angle ACE is equal to the two angles ABC, BAC
Let
the angle ACB be added to each;
therefore
the angles ACE, ACB are equal to the angles BAC, ACB, CBA.
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T H E E L E M E N T S |
Book VI Proposition 31 | |
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But the angle ACD was also proved equal to the angle BAC; therefore the whole angle ACE is equal to the two angles ABC, BAC Let the angle ACB be added to each; therefore the angles ACE, ACB are equal to the angles BAC, ACB, CBA. |
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