### Exercise condition:

7
A college play ground is in the shape of a circle with radius 143 $$m$$. Four tracks each of 4 $$m$$ wide has to be constructed inside the play ground for  track events. Find out the area of the tracks and the cost of constructing the track at the rate of $$₹$$70 per sq. m.

Area of the $$4$$tracks is  ${m}^{2}$.
The total Cost of constructing the track is $$₹$$ [Submit answer in the whole amount].