Euclid's Elements — Book I, Proposition 29
A straight line falling on parallel straight lines makes the algernate angles equal to one another, the exterior angle equal to the interior and opposite angle, and the interior angles on the same side equal to two right angles. Required Propositions: I.13 - • Euclid's Elements — Book I, Proposition 13 I.15 - • Euclid's Elements — Book I, Proposition 15 The first usage of Postulate 5.
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