Question 37

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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: 

$\begin{align}  & \text{Total sum of exterior angles is }{{360}^{\circ }} \\ & 9n={{360}^{\circ }} \\ & n=\frac{{{360}^{\circ }}}{9}={{40}^{\circ }} \\\end{align}$

maths year: