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Csa of cylinder=2πrh
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C.S.A here means curved surface area, right?? Then, C.S.A=2*[22/7]*4*3=75.4 sq.cm If by any chance C.S.A refers to cross sectional area then... C.S.A=22/7*4^2 =22/7*16~50.28 sq cm
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