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WAEC Mathematics 1996 Question 26

Question 26

Angles and Polygons

How many sides has a polygon if the sum of its interior angles is 1440°?

  1. A.6
  2. B.7
  3. C.8
  4. D.9
  5. E.10
Show the answer and explanation

Answer: E (10)

Explanation

Sum of interior angles = (n − 2) × 180°. So (n − 2) × 180 = 1440, n − 2 = 8 and n = 10.