Find -i- the lateral or curved surface area of a closed cylindrical petrol storage tank that is - - i i - - 4-2 - mathrm - m - - in diameter and - 4-5 mathrm - m - - high- how much steel was actually used- - frac - 1 - - 12 - - of the steel actually used was vasted in making the tank

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Find (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is \( ( i i ) \) 4.2 \( \mathrm { m } \) in diameter and \( 4.5 \mathrm { m } \) high. how much steel was actually used, if \( \frac { 1 } { 12 } \) of the steel actually used was vasted in making the tank