Exterior of an angle

Definition

The region that lies outside the angle is called the exterior of an angle.

Introduction

An angle is geometrically formed by the meeting of two straight lines at their starting point in a plane. There are several points outside the angle, the set of all external points forms a region in the plane and that external region of an angle is called the exterior of an angle.

Example

Let’s clearly learn what the exterior of an angle really is, in geometry with graphical animation.

1. Consider a point in a plane and it is denoted by $O$.
2. Draw a straight line from point $O$ and it passes through a point $P$.
3. Similarly, draw another straight line from point $O$ and it passes through a point $Q$.

The two straight lines $\overrightarrow{OP}$ and $\overrightarrow{OQ}$ are started from the point $O$ and it is also their meeting point. The meeting of the straight lines at that point forms an angle between them geometrically.

There are several points, outside the $\angle POQ$. The collection of such points forms a region, it is outside the angle and it is called the exterior of an angle.

A free math education service for students to learn every math concept easily, for teachers to teach mathematics understandably and for mathematicians to share their maths researching projects.