Find

(i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.

(ii) how much steel was actually used, if \frac { 1 }{ 12 } of the steel actually used was wasted in making the tank?

(i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.

(ii) how much steel was actually used, if \frac { 1 }{ 12 } of the steel actually used was wasted in making the tank?