Question

an athlete runs around a circular park 10 times. if the diameter of park is 280m find the distance covered by the athelete in km . answer is 8.8 km

Answer 1

diameter -- 280m ,,, circumference -- πd -- 880m in 10 rounds --- distance --- 8800m--- 8.8 km

Answer 2

Diameter of the circle (d) = 280m
radius of the circle (r) = 280m/2 = 140m

Distance covered in one round = Circumference of the circle.

We have to find the boundary length of the circle first.

Circumference of the circle= 2πr
Which in our case becomes:
$2( \frac{22}{7} )(140) m\\ = 880m$


So the distance covered in one round=880m

Distance covered in 10 rounds= 880×10m = 8800m.


Converting this data in km you'll end up with
$\frac{8800}{1000} \\ = 8.8km$