Radius = diameter/2 so 16/2 = 8 inches.
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You multiply the radius of the circle 0.5 (radius of a 1 inch pipe) by 3.14(pi) by the height of the pipe 12 inches which gives you 18.84ozs.
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what is the radius? It depends on the the radius. Formula 3.14*radius squared*5=answer
16 inch circumference: radius = diameter / 2. diameter = circumference/pi, so radius = 16 in / 2 / pi = (8/pi) inches [approx 2.55 inches] 16 inch diameter: radius = diameter / 2 = 16 in / 2 = 8 inches.
The weight of the pipe will depend on its volume, The volume in turn, will depend oninner radius or diameter,outer radius or diameter,length.Only one of these is given.