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Find(i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is4.2 m in diameter and 4.5 m high.(ii) how much steel was actually used, if `1/(12)` of the steel actually used was wasted in making the tank

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1)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`

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