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Each of the interior angles of a regular polygo... - JAMB Mathematics 1990 Question

Each of the interior angles of a regular polygon is 140o. How many sides has the polygon?
A
9
B
8
C
7
D
5
correct option: a
For a regular polygon of n sides

n = \(\frac{360}{\text{Exterior angle}}\)

Exterior < = 180o - 140o

= 40o

n = \(\frac{360}{40}\)

= 9 sides
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