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If a pipe is 12 inches aroud, then that is its circumference. The width is the diameter. To get the diameter, you'll have to divide 12 by pi, or 3.14, and the answer you get is 12/3.14=3.82.
To calculate the outside diameter of a roll of carpet, you can use the following formula: Outside Diameter (in inches) = √[(Weight in pounds / (Width in feet x Length in feet)) * 32] In your case: Weight = 1000 pounds Width = 12 feet Length = 180 feet Outside Diameter (in inches) = √[(1000 / (12 x 180)) * 32] Outside Diameter ≈ √[(1000 / 2160) * 32] Outside Diameter ≈ √(0.1481 * 32) Outside Diameter ≈ √4.7392 Outside Diameter ≈ 2.18 inches So, the outside diameter of a 1000-pound roll of carpet that is 12 feet by 180 feet is approximately 2.18 inches.
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A 12 inch diameter round pipe will hold 4.89 UK gallons or 5.88 US gallons per foot.
Assuming the 12" pipe means 12" internal diameter, giving us a 6" radius: Volume of a cylinder is (pi) r^2 h (3.14) (6*6) (12) = (3.14) (36) (12) = 1356.48 cubic inches.