waecmaths question:
A regular polygon has 9 sides. What is the size of one of the its exterior angles?
Option A:
20o
Option B:
40o
Option C:
90o
Option D:
140o
waecmaths solution:
$\begin{align} & \text{Total sum of exterior angles is }{{360}^{\circ }} \\ & 9n={{360}^{\circ }} \\ & n=\frac{{{360}^{\circ }}}{9}={{40}^{\circ }} \\\end{align}$
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