A flower bed is the region lying between two circles of radii 14 m and 7 m drawn about the same centre, bounded on the two straight sides by radii that make an angle of 120° at the centre. Find its area in m2. Take π = 22/7.
Competition practiceAreas & Volumes
A462
B77
C308
D154
Step-by-Step Solution
Area = (120/360) × π(142−72)=(1/3)×(22/7)×(196−49)=(1/3)×(22/7)×147=(1/3)×462=154m2.
Answer: D) 154
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