Railway track is an example of perpendicular lines

think of definition of line and point

We can't line on a piece of paper.

If the figures will coincide, they are equal to one another.

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.

The Line segment is just part of a line.

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.