Question

There is a circular track with outet radius 10.5m and inner radius 7 m a)the cost of levelling the track at rupees 24 per metre square

Answer 1

let levelling
=πR²-πr²
=π(R+r)(R-r)
=22/7(10.5+7)(10.5-7)
=22/7(17.5)(3.5)
=192.5