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.
Recall Euclid's axioms.
Video Lessons for CBSE class 9 maths
Worksheets for CBSE class 9 maths
NCERT Solutions for CBSE class 9 maths
Exemplar Solutions for CBSE class 9 maths
Support Services for CBSE class 9 maths
Regular Classes for CBSE class 9 maths