Question on: WAEC Mathematics - 2007
Each of the interior angle of a regular polygon is 162o. How many sides has the polygon?
A
8
B
12
C
16
D
20
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Correct Option: D
(\frac{(n - 2)180}{n}) = 162 (where n = no. of sides)
162n = 180n - 360
162n - 180n = -360
-18n = - 360
n = (\frac{360}{18})
n = 20
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