A regular polygon has 9 sides. What is the size of one of its exterior
MATHEMATICS
WAEC 2005
A regular polygon has 9 sides. What is the size of one of its exterior angles?
- A. 20°
- B. 40°
- C. 90°
- D. 140°
Correct Answer: B. 40°
Explanation
Exterior angle \(=\frac{360}{n}\) where n = no of sides
\(=\frac{360}{9}=40^{\circ}\)
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