Question

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

Answer 1

area of circle= πr^2

154=22/7r^2

154×7/22=r^2

r=√7×7

r=7m

circumference=2πr

=2×22/7×7

=44m

=0.044km

2 round=0.088km

distance=0.088km

speed=5km/h

time=d/speed

time=0.088/5

time=0.0176h

Answer 2

Answer:

Step-by-step explanation:

Area of the field = 154m^2

=> πr^2 = 154

=> (22/7)*r^2 = 154

=> r^2 = 154*7/22

=> r^2 = 49

=> r = 7

so the length of

the circumference = 2πr

= 2*22/7*7m

= 44 m

So 2 complete rounds will have the distance of 88 m

She jogs 5000m in 3600s

So,she'll jog 88m in 3600/5000*88s

=63.36 s=1 min 3s