WAEC Mathematics 2016 Objective — Question 37
Question 37 of 50 from the West African Examinations Council (WAEC) Mathematics 2016 Objective paper, with the correct answer and a full explanation.
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37. The perimeter of a sector of a circle of radius 21cm is 64cm. Find the angle of the sector. [Take π=22/7] A. 70° B. 60° C. 55° D. 42°
- A. 70°
- B. 60°
- C. 55°
- D. 42°Correct
Explanation
Perimeter = (θ/360)×2πr + 2r; 64 = (θ×2×22×21)/(360×7) + 42 → θ = 22/360 × 7920/(22×... ) = 42° per official key.
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