# Perpendicular Lines

Two lines are said to be perpendicular when they intersect to form right angle (or 90 degrees)

Keyword Here is 90 degrees

Below are some examples of Perpendicular Lines

## Angle in Perpendicular Lines

When you extend both the lines of perpendicular angle, you will find that all the angle developed are 90 degrees

In the above image you can see that angle formed by line extensions are 90 degree
Thus,
\angle A\ = \angle B\ = \angle C\ = \angle D\ = 90 degree

## Symbol for Perpendicular Lines

Perpendicular lines are represented by ” \perp ” symbol.

Hence if line A & B are perpendicular to each other, this can be written in short form as:

## How to construct Perpendicular lines

We will discuss two methods to draw perpendicular lines:
(a) Using Ruler
(b) Using Protractor

### Drawing Perpendicular lines using Ruler

(a) Draw horizontal line using ruler

(b) Now arrange the ruler vertically on the horizontal line

(c) Draw vertical line with the help of ruler

(d) Remove the ruler and you will have perpendicular line

### Drawing Vertical Line using Protractor

(a) Take Protractor and draw horizontal line using protractor straight side

(b) Use the Protractor to draw a line with 90 degree angle

(c) Remove the protractor and you will have perpendicular lines

## Frequently Asked Questions :- Perpendicular lines

(01) Difference between Parallel & Perpendicular lines

Parallel lines do not intersect.
Perpendicular lines intersect at 90 degree angle

(02) Is line intersecting at 30 degree perpendicular?