**What is an angle?**

When two line meet at a common point an angle is formed.

Like length of object is measured in Meter

or Weight of object is measured in Kilograms

Similarly angle between the lines is measured in **degrees**

**Parts of Angle**

**Arms**

The ray forming the angle is known as arms

Here OA & OB are the two arms

**Vertex**

The point at which two ray meet is known as Vertex

Here point O is the vertex

**How to name the angle**

The angle is named using symbol “ \angle “

Hence, the above angled can be named as \angle O or \angle AOB

**Naming of Multiple Angles**

Above image shows multiple angles.

We can name the angles as follows:

\angle 1 or \angle AOB

\angle 2 or \angle BOC

\angle 3 or \angle COD

\angle 4 or \angle DOE

**Angle Comparison**

The more open the lines, the greater the angle will be.

In the below figure one simply observe that:

\angle 2 is greater than \angle 1, just because the line between angle 2 is more open.

**Interior and Exterior Points of Angle**

Any point which lies inside the two arms are in interior of angle

Point which is outside the two arms are in exterior of angle

In the above figure you can observe that:

Point 1 & 2 are in interior of \angle AOC

Point 3 & 4 are in exterior of \angle AOC

**Important FAQ’s**

**(01) What is Vertex in angle?**

Read Solution

It is the point where two ray meet to form angle

**(02) What is unit of measurement of Angle?**

Angle is measured in Degrees

**(03) How to measure any given angle**

Angle can be measured using a Protractor