Parallel Intersecting and Perpendicular Lines         

Definition:

Parallel Lines

Two or more lines in a plane that never intersect or touch each other are called “Parallel lines”.

The symbol “∥” is used to denote parallel lines.

Example- PQ ∥ RS denoted that line PQ parallel to line RS. 

     Intersecting lines                  Parallel lines

       Intersecting Lines

Two or more lines in a plane that meet at a point are called “Intersecting lines”.

Two or more lines in a plane that meet at a point are called “Intersecting lines”.

The point where intersecting lines are meet is called the “point of intersection”. 

It does not matter that what angles the lines meet. In above figure “O” is the point of intersection.

These two lines intersect at the point O.

More than two lines intersects:

Perpendicular lines

Two or more lines that meet at a 90 degree angle or a right angle are called Perpendicular lines.

The symbol “⊥” is used to denote perpendicular lines.

In above figure we see the symbol of perpendicular lines ⊥ AB  XY. 

Below we can see parallel lines, intersecting lines and perpendicular lines.