Question

Explain Euclids fifth postulate ?

Answer 1

If a straight line crossing two straight lines makes the interior angles on the same side less than two right angles, the two straight lines, if extended indefinitely meets on that side on which are the angles less than the two right angles.

If the sum of two angles A and B formed by a line L and another two lines $L_{1}and{L}_2$ sum up to less than two right angles then lines $L_{1}and{L}_2$ meet on the side of angles A and B if continued indefinitely.