Question

A regular polygon with each exterior angle of 18^o has ______ sides.

• A. 18
• B. 20
• C. 10
• D. 12

Answer 1

The correct option is B

20

We know that sum of all exterior angles of a polygon is 360^o.

Since, the polygon is regular, so all the exterior angles are equal.

Measure of each exterior angle = 18^o (Given)

Let there be n exterior angles.

Therefore,

n x 18^o = 360^o

n = 20