Circumference: 2*pi*3 = 6*pi inches
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3 inches, perhaps!
You multiply the diameter by Pi (about 3.1416) to get the circumference.
A circle with a radius of 3 inches has an area of 28.27 square inches.
A cylinder with a radius of 7in and a length of 3in has a total surface area of about 439.82 square inches.
The volume is 367.57 cubic inches.