Euclid's Elements Book 1: Proposition 27, Parallel Lines 1
This is the twenty seventh proposition in Euclid's first book of The Elements. This proof is the first involving parallel lines.

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Euclid's Elements Book 1: Proposition 28 Part 1, Parallel Lines 2

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Euclid's Elements: Book 1, Prop 27

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Euclid's Elements: Book 1, Prop 28

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Euclid’s Elements Book 1 Proposition 47

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Euclid's Elements: Book 1, Prop 29

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Euclid's Elements: Book 1, Prop 32

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Euclid's Elements Book 1, Proposition 26

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