what is the total surface area of a hollow cylinder
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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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the TSA of hollow cylinder is 2Π(R+r)(h+R-r)
where R is inner radius and r is outer radius
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