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WAEC Mathematics 2006 Question 44

Question 44

Angles and Polygons

The values of three angles at a point are 3y − 45°, y + 25° and y°. Find the value of y.

  1. A.40°
  2. B.58°
  3. C.68°
  4. D.76°
Show the answer and explanation

Answer: D (76°)

Explanation

Angles at a point add to 360°: 5y − 20 = 360, so 5y = 380 and y = 76°.