Find the lateral curved surface area of a cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high. How much steel was actually used, if `1/(12)` of steel actually used was wasted in making the closed tank?

Explanation

CSA=`2pirh`

=`2*22/7*2.1*4.5`

=`59.4m^2`

`T-T/12=59.4m^2`

`T=12*5.4m^2`

`T=64.8m^2`