Interior of an angle

Definition

The region that lies within an angle is called the interior of an angle.

Introduction

Geometrically, an angle is formed, when two straight lines meet each other at their starting point in a plane. Now, there are several points within the angle, the set of all internal points forms a region in the plane and that internal region of the angle is called the interior of an angle.

Example

It is time to learn what the interior of an angle really is, in geometry with graphical animation.

1. Firstly, consider a point in a plane and it is denoted by $O$.
2. Draw a line from point $O$ and let’s assume that it passes through a point $P$.
3. Similarly, draw another straight line from point $O$ and also assume that it passes through a point $Q$.

Actually, the two straight lines $\overrightarrow{OP}$ and $\overrightarrow{OQ}$ are started from the point $O$, where the two lines meet each other. The meeting of two straight lines at that point forms an angle between them geometrically.

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

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