Each of the interior angles of a regular polygon is 140°. How many sides has the polygon?
A
9
B
8
C
7
D
5
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
For a regular polygon of n sides
n = \(\frac{360}{\text{Exterior angle}}\)
Exterior < = 180^\circ - 140^\circ
= 40^\circ
n = \(\frac{360}{40}\)
= 9 sides
Source: WAEC / JAMB / NECO Classroom Archive (Record #31477)