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let BC be produced to D. [Post.2]
then, since the angle ACD is an exterior angle of the triangle ABC,
it is greater than the interior and opposite angle ABC. [1.16]
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T H E E L E M E N T S |
Book I Proposition 17 | |
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For let BC be produced to D. [Post.2] then, since the angle ACD is an exterior angle of the triangle ABC, it is greater than the interior and opposite angle ABC. [1.16] |
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