The interior angle of a convex polygon is formed by two adjacent sides of the polygon.

### Example

In the figure below, angle *BDC* is an interior angle of polygon *ABCD*. It is formed by the side *BD* and the

side *CD*.

The interior angle of a convex polygon is formed by two adjacent sides of the polygon.

In the figure below, angle *BDC* is an interior angle of polygon *ABCD*. It is formed by the side *BD* and the

side *CD*.