T H E E L E M E N T S |
Book VI Proposition 3 | |
Again, since the straignt line BAE falls upon the parallels AD, EC, the exterior angle BAD is equal to the interior angle AEC. [I.29] But the angle ACE was also proved equal to the angle BAD; therefore the angle ACE is also equal to the angle AEC, so that the side AE is also equal to the side AC. [I.6] |
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