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# Identifying parallel and perpendicular lines 0%

Summary

# Identifying parallel and perpendicular lines

## ​​In a nutshell

There are pairs of lines that have relationships to each other that are useful to know. Perpendicular lines are at a $90\degree$ angle to each other. Parallel lines never touch and stay the same distance away from each other.​

## Perpendicular lines

When a line meets another at an angle of  $90\degree$, the lines are perpendicular. Examples of perpendicular lines are the corners of a piece of paper.

## Parallel lines

When two lines stay the same distance apart and never touch, they are parallel. A pair of train tracks are parallel lines, for example.

##### ​​Example 1

Are these lines perpendicular or parallel to each other?

These lines touch so they cannot be parallel lines.

They meet at a $90\degree$ angle, so:

The lines are perpendicular to each other.

FAQs

• Question: What are parallel lines?

Answer: Parallel lines never touch and stay the same distance away from each other.

• Question: What are perpendicular lines?

Answer: Perpendicular lines are at a 90 degree angle to each other.

• Question: What is an example of parallel lines?

Answer: A pair of train tracks is an example of parallel lines.

Theory

Exercises