Question

formulae to find curved surface area of hollow cylinder??????​

Answer 1

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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Answer 2

As its curved surface area...

CSA= 2πrh