Each of the interior angles of a regular polygo... - JAMB Mathematics 2021 Question
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
correct option: a
Interior angles of a regular polygon = \(\frac{(n - 2)180}{n}\)
140 = \(\frac{(n - 2)180}{n}\)
140n = 180n - 360
40n = 360
n = 9 sides
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