Each interior angle of a regular polygon is 108°. How many sides has it?

A.
5 
B.
7 
C.
9 
D.
14
Correct Answer: Option A
Explanation
The exterior angle of the polygon = 180 – 108 = 72°. The sum of exterior angle of the regular polygon = 360°
The number of sides (=frac{360}{72}=5)