Question
A hollow cylinder is made up of steel. the difference in
its outer and inner curved surface area is 132cm2.Height of cylinder is 21 cm and sum of the inner and outer radius is also 21 cm. Find the Total surface of the hollow cylinder.Solution
We have -2 Ο h (R-r) = 132 = 2Γ22/7Γ21(R-r) =132 R-r = 1 Also given β R + r = 21 Then β R = 11cm, r = 10cm. So, the total surface of the hollow cylinder = 2 Ο h(R-r) +2 Ο (R2-r2) =2 Ο (R +r) [h +R-r] =2Γ22/7Γ21(21+1) =6Γ22Γ22 =2904cm2
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