A hollow cylinder is made up of steel. the difference in its outer and inner curved surface area is 176cm2.Height of cylinder is 28 cm and sum of the inner and outer radius is also 29 cm. Find the Total surface of the hollow cylinder
We have -2 π h (R-r) = 176 = 2×22/7×28(R-r) =176 R-r = 1 Also given – R + r = 29 Then – R = 15cm, r = 14cm. So, the total surface of the hollow cylinder = 2 π h(R-r) +2 π (R2-r2) =2 π (R +r) [h +R-r] =2×22/7×29(28+1) =6×22×22 =5286.28cm2
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