Euclid's Elements — Book I, Proposition 39
Equal triangles which are on the same base and on the same side are also in the same parallels. Required Propositions: I.31 - • Euclid's Elements — Book I, Proposition 31 I.37 - • Euclid's Elements — Book I, Proposition 37

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Euclid's Elements — Book I, Proposition 38

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