Question

the area of a circular field is 154 m square find the time taken by an athlete to complete two rounds if she is jogging at the rate of 5 km​

Answer 1

Area=154m square

So we have to find out radius

154=πr square

154=22/7×r×r

154×7\22=r square

7×7=r square

49=r square

r=√49

r=7

Then circumference will be

C=2πr

C=2×22/7×7

C=44m

So if he runs two rounds then distance will be

44×2=88m

Speed =5km/h

D=S×T

88=5000×T

88/5000=T

0.0176hour=T