Math Doubts

Parallel lines

Two or more straight lines which do not intersect each other at any point on the plane are called parallel lines.

graphical representation of parallel lines

Parallel lines are straight lines basically and they appear on a plane side by side. They never intersect each other anywhere on a plane because of having same angle. Therefore, if two or more straight lines have same angle, then they do not meet each other.

Similarly, the vertical distance between opposite points of them is always same due to the parallelism of the parallel lines.


Formation of parallel lines

$\overleftrightarrow{AB}$ and $\overleftrightarrow{CD}$ are two straight lines and they are extended infinitely but they do not intersect each other even though they are appearing side by side.

They maintain equal distance between them at all their opposite points. The reason for this is the angles of both straight lines are same.

The straight lines $\overleftrightarrow{AB}$ and $\overleftrightarrow{CD}$ are called parallel lines.


A double vertical line ($\|$) is used to represent parallelism of the lines mathematically.

The parallel symbol is displayed between straight lines to express that they both are parallel lines.

$\overleftrightarrow{AB} \,\, \| \,\, \overleftrightarrow{CD}$

It is read as $\overleftrightarrow{AB}$ parallel to the $\overleftrightarrow{CD}$.

Similarly, it can also be displayed in other way.

$\overleftrightarrow{CD} \,\, \| \,\, \overleftrightarrow{AB}$

It is read as $\overleftrightarrow{CD}$ parallel to the $\overleftrightarrow{AB}$.

Math Doubts

A best free mathematics education website for students, teachers and researchers.

Maths Topics

Learn each topic of the mathematics easily with understandable proofs and visual animation graphics.

Maths Problems

Learn how to solve the math problems in different methods with understandable steps and worksheets on every concept for your practice.

Learn solutions

Subscribe us

You can get the latest updates from us by following to our official page of Math Doubts in one of your favourite social media sites.

Copyright © 2012 - 2022 Math Doubts, All Rights Reserved