The circumferance is found by using the formula 2(r)(pi). r stands for the radius. The diameter, which is already given in the problem, is two time radius. Therefore the only thing you really have to do is multiple the diameter= 3 inches by pi. Circumferance is 9.425 inches.
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Multiply the diameter by Pi (about 3.1416). The result is the circumference:3 x 3.1416 = 9.4248 inches circumference
pi*3 is approximately 9.424777961 inches
Circumference: 29*pi = 91.106 inches to 3 decimal places
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.
diameter = 26/pi = 8.276057041 or 8.276 inches to 3 decimal places