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Circumference = pi * diameter c = 10*pi inches c ~= 31.4 inches
diameter = 10/pi inches
A cylinder with a height of 10 inches and a diameter of 8 inches has a surface area of 351.86 square inches.
A circle with radius of 3 inches doesn't have a diameter of 10 inches. If the radius is 3, then the diameter is 6, and the circumference is (6 pi) = 18.85 . (rounded) If the diameter is 10, then the radius is 5, and the circumference is (10 pi) = 31.42 . (rounded) The diameter is always double the radius, and the radius is always half of the diameter.
Circumference = diameter x pi = 31.416 inches (rounded)