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WAEC Mathematics 2007 Question 21

Question 21

Angles and Polygons

Each interior angle of a regular polygon is 162°. How many sides has the polygon?

  1. A.8
  2. B.12
  3. C.16
  4. D.20
Show the answer and explanation

Answer: D (20)

Explanation

Each exterior angle = 180° − 162° = 18°, and n = 360° ÷ 18° = 20.