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WAEC Mathematics 1993 Question 20

Question 20

Angles and Polygons

The sum of the interior angles of a regular polygon is 30 right angles. How many sides has the polygon?

  1. A.34 sides
  2. B.30 sides
  3. C.26 sides
  4. D.17 sides
  5. E.15 sides
Show the answer and explanation

Answer: D (17 sides)

Explanation

Sum of interior angles = (2n − 4) right angles, so 2n − 4 = 30 and n = 17.