If r and r denote the external and internal radii of a hollow right circular cylinder respectively and h is the height, then the total surface area becomes
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External radius = R
internal radius =r
height =h
total surface area will be
CSA of inner side + CSA of external side +2[area of bigger base - area of smaller base ]
=2πrh+2πRh+2[πR²-πr²]
=2π(rh+Rh)+2π(R²-r²)
2π(rh+Rh)+2π(R+r)(R-r)
2πh(r+R)+2π(R+r)(R-r)
2π(r+R)(h+R-r)
internal radius =r
height =h
total surface area will be
CSA of inner side + CSA of external side +2[area of bigger base - area of smaller base ]
=2πrh+2πRh+2[πR²-πr²]
=2π(rh+Rh)+2π(R²-r²)
2π(rh+Rh)+2π(R+r)(R-r)
2πh(r+R)+2π(R+r)(R-r)
2π(r+R)(h+R-r)
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