Euclid's Elements — Book I, Proposition 28
If a straight line falling on two straight lines make the exterior angle equal to the interior and opposite angle on the same side, or the interior angles on the same side qual to two right angles, the straight lines will be parallel to one another. Required Propositions: I.13 - • Euclid's Elements — Book I, Proposition 13 I.15 - • Euclid's Elements — Book I, Proposition 15 I.27 - • Euclid's Elements — Book I, Proposition 27
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