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A man riding a bicycle, completes one lap of a circular field along its circumferences at the speed of 14.4 km/h in 1 min 28 s. What is the area of the field?
- A7958 $m^{2}$
- B9856 $m^{2}$
- C8842 $m^{2}$
- DCannot be determined
Answer not set
Discussion 1
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Solution
Distance travelled in 1min 28 sec = Speed *time
Speed = 14.4km/hr = 14.4*5/18 m/s = 4m/s
Distance = 4*88 = 352
$2\pi r = 352$
r = 56
Area =$\pi r^2$ = 22*56*56/7 = 9856
Distance travelled in 1min 28 sec = Speed *time
Speed = 14.4km/hr = 14.4*5/18 m/s = 4m/s
Distance = 4*88 = 352
$2\pi r = 352$
r = 56
Area =$\pi r^2$ = 22*56*56/7 = 9856