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Then since
AB is parallel to CD, and BC has fallen upon them,
the alternate angles ABC, BCD are equal to one another. [I.29]
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T H E E L E M E N T S |
Book I Proposition 33 | |
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Let BC be joined. Then since AB is parallel to CD, and BC has fallen upon them, the alternate angles ABC, BCD are equal to one another. [I.29] |
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