Euclid's Elements Book 1: Proposition 31, Constructing Parallel Lines
This is the thirty first proposition in Euclid's first book of The Elements. This construction proof shows how to build a line through a given point that is parallel to a given line.

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Euclid's Elements Book 1: Proposition 32, The Sum Of The Angles In A Triangle

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Euclid's Elements Book 1: Proposition 29, Parallel Lines Converse

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