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    Question

    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
    A 3648.3 Correct Answer Incorrect Answer
    B 4236.20 Correct Answer Incorrect Answer
    C 5286.28 Correct Answer Incorrect Answer
    D 2846.56 Correct Answer Incorrect Answer

    Solution

    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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