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

  • A 20o
  • B 40o
  • C 90o
  • D 140o

The correct answer is B. 40o

Exterior angle \(=\frac{360}{n}\) where n = no of sides

\(=\frac{360}{9}=40^{\circ}\)

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