Question

The area of circular field is 154 m2. Find the time taken by a athlete to complete 2 rounds if he s jogging at the rate of 5 km/hr

Answer 1

Area = πr²

πr² = 154
r²   = 154 x 7/22
     = 49
r =  √49 = 7

Circumference = 2πr
                        = 2 × 22/7 × 7
                        =  44 m
Area to jog = 2(2πr) 
                  = 2 (44) m = 88m  = 0.088 km

Speed = 5 km/h 
     
time =  88/1000 ÷ 5 
          = 21.12 

Answer 2

Area of circular field = 154 m^
Area=πr^2
154=22/7r^2
154×7/22=r^2
r^2=49
r=√49
r=7
Perimeter=2πr
=2×22/7×7
=44m
Distance for covering one round=44m
Distance for covering two rounds=44×2
=88m
Speed=5km/hr
=5×1000/60×60
=25/18 m/s
speed=distance/time
=88×18/25
=63.36 seconds
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