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WAEC Mathematics 1992 Question 27

Question 27

Angles and Polygons

A regular polygon has each of its exterior angles as 18°. How many sides has the polygon?

  1. A.10
  2. B.11
  3. C.12
  4. D.20
  5. E.24
Show the answer and explanation

Answer: D (20)

Explanation

Exterior angles of a polygon add up to 360°, so the number of sides = 360° ÷ 18° = 20.