formulae to find curved surface area of hollow cylinder??????
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Answer:
2π ( r1 + r2 )( r2 - r1 +h)
Step-by-step explanation:
The total surface area of a hollow cylinder is 2π ( r1 + r2 )( r2 - r1 +h), where, r1 is inner radius, r2 is outer radius and h is height.
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As its curved surface area...
CSA= 2πrh
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