A sector of a circle of radius 9cm subtends angle 120° at the centre of
MATHEMATICS
WAEC 1993
A sector of a circle of radius 9cm subtends angle 120° at the centre of the circle. Find the area of the sector to the nearest cm2 [Take π = 22/7]
- A. 75cm2
- B. 84cm2
- C. 85cm2
- D. 86cm2
Correct Answer: C. 85cm2
Explanation
Area of a sector = θ/360 x πr\(^2\)
= 120/360 x 22/7 x 81/1
= 84.86 cm\(^2\)
\(\approxeq\) 85cm\(^2\) (to the nearest cm)
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