The intersecting lines which contain right angle between them are called perpendicular lines.

Straight lines are often intersected in a plane in geometrical system. Occasionally, they get intersected by an angle of $90$ degrees (right angle).

In this case, the straight lines are called as perpendicular lines.

$\small \overleftrightarrow{AB}$ and $\small \overleftrightarrow{CD}$ are two straight lines and they are intersected by an angle of $90^\circ$ in a plane at point $\small O$. Therefore, the straight lines $\small \overleftrightarrow{AB}$ and $\small \overleftrightarrow{CD}$ are said to be perpendicular to each other.

- $\small \overleftrightarrow{AB}$ is called as perpendicular line to $\small \overleftrightarrow{CD}$, and represented by $\small \overleftrightarrow{AB} \perp \overleftrightarrow{CD}$.
- $\small \overleftrightarrow{CD}$ is called as perpendicular line to $\small \overleftrightarrow{AB}$, and denoted by $\small \overleftrightarrow{CD} \perp \overleftrightarrow{AB}$.

Latest Math Topics

Latest Math Problems

Email subscription

Math Doubts is a free math tutor for helping students to learn mathematics online from basics to advanced scientific level for teachers to improve their teaching skill and for researchers to share their research projects.
Know more

Learn how to solve easy to difficult mathematics problems of all topics in various methods with step by step process and also maths questions for practising.