# Each exterior angle of a regular polygon measures 20. How many sides does the polygon have?

##### 1 Answer

Dec 13, 2016

#### Explanation:

A very useful property to know of any polygon, whether regular or irregular, is that the sum of the exterior angles is always 360°.

For a regular polygon, the size of each exterior angle,

Using this property, if you know the size of the exterior angle, you can find the number of sides.