A regular polygon has 9 sides. What is the size of one of its exterior angles?

A.
20^{o} 
B.
40^{o} 
C.
90^{o} 
D.
140^{o}
Correct Answer: Option B
Explanation
Exterior angle (=frac{360}{n}) where n = no of sides
(=frac{360}{9}=40^{circ})
Exterior angle (=frac{360}{n}) where n = no of sides
(=frac{360}{9}=40^{circ})