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WAEC Mathematics 2012 Question 40

Question 40

Angles and Polygons

The sum of the interior angles of a regular polygon is 1800°. How many sides has the polygon?

  1. A.16
  2. B.12
  3. C.10
  4. D.8
Show the answer and explanation

Answer: B (12)

Explanation

(n − 2) × 180° = 1800°, so n − 2 = 10 and n = 12.