Angle is formed between two rays with a common end point.

The common end point is called
**
vertex
**
of the angle

and the rays are called
**
arms
**
of the angle.

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**
How do we name the angle?
**

Suppose the angle is

We can call it

∠ B

Or

∠ ABC

Symbol of angle → ∠

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**
Interior and Exterior of an angle
**

Let us take the angle

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**
Example
**

**
**

X, Y is in interior of ∠ABC

Z is on ∠ABC

P, Q is in exterior of ∠ABC