What is the Exterior and Interior angle?

Exterior and Interior angle:

• Any angle that is on the inside of a shape is called an interior angle.
• Any angle that is on the outside of a shape is called an exterior angle.

An exterior angle is made by extending one of the lines of the shape beyond the intersection point.

In the figure,

Angles ABC, BCA and BAC are interior angles.

Angle ACD is an exterior angle.