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Surface area of the pipe: diameter*pi*length but make sure that the diameter and length are both in meters or inches.
It is: 0.5*pi*7 = 11 square feet rounded
Measure the length of the pipe and the inner Dia of the pipe. 2 x pi x Radius x length is the inner surface area
It depends on what you mean by a 30 pipe. Is 30 the cross sectional area - in which case, what is the length of the pipe? Is 30 the length - in which case, what is the cross-sectional area?
It depends on the length of the pipe.