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WAEC Mathematics 2001 Question 36

Question 36

Angles and Polygons

Which of the following is not the size of an exterior angle of a regular polygon?

  1. A.15°
  2. B.18°
  3. C.20°
  4. D.21°
Show the answer and explanation

Answer: D (21°)

Explanation

An exterior angle must divide 360° exactly. 360 ÷ 21 is not a whole number, so 21° is impossible.