Draw two circles of the same radii and then observe.
Think about solid
If the sum of the interior angles is equal to the sum of the right angles, then the two lines will not meet each other at any given point.
Recall Euclid's axioms.
If the figures will coincide, they are equal to one another.
We can draw as many lines through a single point.
Recall the facts from Euclid's geometry.
Euclids fifth postulate
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