Notice that if you were to slit the cylinder down the side, unroll it, and lay it flat,
you'd have a rectangle, with one dimension equal to the circumference of the base,
and the other dimension equal to the height of the cylinder.
The surface area is just "rectangle's" (length) x (width) = (2 pi R) x (h) .
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Total surface area = (2*pi*radius2)+(diameter*pi*height)
Total surface area = (2*pi*r2)+(2*pi*r*height) Surface area = 69.11503838 or 69 square units
you divide the surface area by the circumference.
if the cylinder is on the inside, it would not affect the surface area. otherwise, subtract the part of the inside cylinder that touches the outside from the cylinder
Surface Area: 2πr2 + 2πrh Volume: πr2h