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JAMB Mathematics 2002 Question 35

Question 35

Angles and Polygons

The sum of the interior angles of a polygon is 20 right angles. How many sides does the polygon have?

  1. A.12
  2. B.20
  3. C.40
  4. D.10
Show the answer and explanation

Answer: A (12)

Explanation

20 right angles = 1800°. Setting (n − 2) × 180° = 1800° gives n − 2 = 10, so n = 12.