Question

A Man runs with a speed of 15.84km/hr.he completes 12 rounds of circular ground in 1 hour
.find area of ground.

Answer 1

Answer:

$0.13 km^{2}$

Step-by-step explanation:

Speed of man is 15.84km/hr                                 (putting pi = 3.14)

So, he runs 15.84 km in one hour.

He completes 12 rounds in 1 hour.

This implies, 12 ( circumference of ground) = 15.84

or, 12 x (2πr) = 15.84

from here, we get r =$\frac{15.84}{2\pi \times 12}$

we get r = 0.21 km

Now, area of a circle is $\pi r^{2}$

So, area = $\pi (0.21)^{2}$

              = $0.13 km^{2}$