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I say that the angle ABC is equal to the angle ACB, and the angle CBD to the angle BCE.
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T H E E L E M E N T S |
Book I Proposition 5 | |
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Let ABC be an isosceles triangle having the side AB equal to the side AC; the straight lines BD, CE having been produced continuously in straight lines with AB, AC. [Post.2] I say that the angle ABC is equal to the angle ACB, and the angle CBD to the angle BCE. |
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