Question on: JAMB Mathematics - 1990
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
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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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