Each of the interior angles of a regular polygon is 140°. How many sides has the polygon?
-
9
- 8
- 7
- 5
The correct answer is: A
Explanation
For a regular polygon of n sides
n = \(\frac{360}{\text{Exterior angle}}\)
Exterior < = 180° - 140°
= 40°
n = \(\frac{360}{40}\)
= 9 sides