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# What do interior angles of a polygon mean?

**An Interior Angle **is an angle inside a shape. The interior angles of a polygon are those angles at each vertex that are on the inside of the polygon. For a regular polygon, by definition, all the **interior angles** are the same.

To find the sum of interior angles of a polygon, multiply the number of triangles in the polygon by **180°**. The formula for calculating the sum of interior angles is $( n − 2 ) × 180°$ where n is the number of sides. All the interior angles in a regular polygon are equal.

The sum of **exterior angles** of a polygon is 360°.

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