# Euclid’s Fifth Postulate

**Tutor description**

If a straight line falling on two straight lines makes the sum of the interior angles on the same side less than the sum of two right angles, then the two straight lines, if produced indeï¬nitely, meet on that side on which the angles are less than two right angles.An equivalent axiom, known as Playfair’s Axiom, expresses Euclid’s Fifth Postulate this way: Through a point not on a given straight line, there is one and only one straight line that does not intersect the

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