The angular elevation is 60∘. The internal and external radii of a hollow cylinder are 12cm and 18cm respectively. If its height is 14cm, then find its curved surface area. (Take π=227)
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Solution
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Let r,R be the internal and external radius and h be height. r=12 cm, R=18 cm, h=14 cm Curved Surface Area =2πh(R+r) square unit =2×227×14(18+12) =2×227×14×30$ =2640cm2
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