Question on: WAEC Mathematics - 2013
An interior angle of a regular polygon is 5 times each exterior angle. How many sides has the polygon?
A
15
B
12
C
9
D
6
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Correct Option: B
Let the interior angle = xo
interior angle = 5xo (sum of int. angle ann exterior)
(angles = angle or straight line)
6x = 180
x = (\frac{180}{6})
x = 30o
no. of sides = (\frac{\text{sum of exterior angles}}{\text{exterior angle}})
= (\frac{360}{30}) = 12
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