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.
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a formula is an equation, rule, principle, or other logical relation. The pipe lateral formula is Ao equals external pipe surface area (feet 2 per feet pipe).
2*pi*r*L where pi is the mathematicl constant approximated by 3.15149, r is the outer radius of the pipe and L is its length.
The formula for the surface area of a sphere is: 4 pi r 2
Surface area of the pipe: diameter*pi*length but make sure that the diameter and length are both in meters or inches.
It depends on the formula that describes the surface itself. "Curved surface area" is not enough information to answer the question.