If a straight line falling on two straight linesmakes the interior angles on the same side of it taken together less than two right angles , then the two straight lines , if produced indefinitely , meet on that side on which the sum of angles is less than two right angles.
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It is a consequence of Euclids's parallel postulate.
No.
geometry
Could you please specify which postulate you are referring to?
When a postulate has been proven it becomes a theorem.