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JAMB Mathematics 1986 Question 31

Question 31

Angles and Polygons

A regular polygon of n sides has 160° as the size of each interior angle. Find n.

  1. A.18
  2. B.16
  3. C.14
  4. D.12.
Show the answer and explanation

Answer: A (18)

Explanation

Each exterior angle is 180° − 160° = 20°, and they add to 360°, so n = 360 ÷ 20 = 18.