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
Each interior angle = \(\frac{(n - 2)180}{n}\)
140 = \(\frac{(n - 2)180}{n}\)
Cross multiply:
140n = 180n - 360
40n = 360
n = 9 sides ( A Nonagon)
Source: WAEC / JAMB / NECO Classroom Archive (Record #60692)