2*pi*radius*length measured in square units
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surface area divided by volume
To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.
Surface area of the pipe: diameter*pi*length but make sure that the diameter and length are both in meters or inches.
2*pi*r*L where r is (outer) radius of the pipe (in case of the outer surface) nd L is the length of the pipe.