Question 43
Mensuration of Plane ShapesThe area of a sector of a circle with radius 7 cm is 51.3 cm2. Calculate, correct to the nearest whole number, the angle of the sector. [Take π = 22/7]
- A.60°
- B.120°
- C.150°
- D.180°
Show the answer and explanation
Answer: B (120°)
Explanation
θ/360 × 22/7 × 49 = 51.3, so θ = 51.3 × 360 ÷ 154 ≈ 119.9 ≈ 120°.