Euclid's Elements — Book I, Proposition 27
If a straight line falling on two straight lines make the alternate angles equal to one another, the straight lines will be parallel to one another. Required Propositions: I.16 - • Euclid's Elements — Book I, Proposition 16

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Euclid's Elements — Book I, Proposition 28

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Euclid's Elements — Book I, Proposition 29

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Euclid's Elements — Book I, Proposition 34

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Euclid's Elements — Book I, Proposition 26

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Euclid's Elements — Book I, Proposition 38

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Euclid's Elements — Book I, Proposition 36

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