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A polygon is a closed figure in which 3 or more line segments are joined together.

A polygon is said to be a “**regular polygon**”

- If all the sides are equal.
- If all the angles are equal.

Basing on the number of sides, the polygons are classified.

If n is the number of sides then,

- Sum of interior angles of a polygon is (n-2) 180°.
- Sum of exterior angles of a polygon is 360°.

For regular polygons,

- Each interior angle is ((n-2)180°)/n.
- Each exterior angle is (360°)/n.

- If all corners of a polygon lie on the same circle then it is called as a cyclic polygon.
- If all the corner angles of a polygon are equal then it is called as equiangular polygon.
- If all the edges of a polygon are equal in length it is called as equilateral polygon.

Example: Calculate the measure of one interior angle of a regular hexadecagon (16 sided polygon).

Answer: Each interior angle is