11. Calculate total cost of constructing the track

A school play ground is in the shape of a circle with radius 42\(m\). Four tracks each of 7\(m\) 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 \(₹\)50 per \(sq\). \(m\).

 

 

The area of the \(4\) tracks is $m^2$

 

The total cost of constructing the track is \(₹\)