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WAEC Mathematics 1994 Question 35

Question 35

Angles and Polygons

If the exterior angles of a quadrilateral are y°, (2y + 5)°, (y + 15)° and (3y − 10)°, find y°.

  1. A.61.43
  2. B.60
  3. C.52.86
  4. D.51.43
  5. E.50.
Show the answer and explanation

Answer: E (50.)

Explanation

Exterior angles add up to 360°: 7y + 10 = 360, so y = 50.