Circumference = 2*pi*radius or pi*diiameter
Circumference = 31.416 units rounded to 3 decimal places
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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 of any circle = (pi) x (diameter) Diameter = 2 x radius
If the circumference of a circle is 10 feet the radius is: about 1.592 feet. For this type of calculation, divide the circumference by Pi (about 3.1416). This gives you the diameter. Next, divide the diameter by two to get the radius.
Circumference = Pi * diameter. so Circumference = pi * 20 = 62.832
Impossible because the diameter of any circle is always twice its radius.