Each of the interior angles of a regular polygon is 140o. How many sides has…

Each of the interior angles of a regular polygon is 140^o. How many sides has the polygon?

Correct Answer: Option A

Explanation

For a regular polygon of n sides
n = (frac{360}{text{Exterior angle}})
Exterior o – 140^o
= 40^o
n = (frac{360}{40})
= 9 sides