Euclid's Elements Book 1: Proposition 30, Relationship Between Parallel Lines
This is the thirtieth proposition in Euclid's first book of The Elements. This proof shows that lines that are parallel to the same thing are parallel to each other.

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Euclid's Elements Book 1: Proposition 31, Constructing Parallel Lines

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Euclid's Elements Book 1: Proposition 35, Parallelogram Area

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

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Euclid's Elements Book 1: Proposition 34, Parallelograms

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

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