C = D x pi = 2 x R x pi
C = circumference
D = diameter
R = radius
pi = 3.141 592 653 ... (a mathematical constant)
Example:
Let
R = 10 inches
Then
C = 2 x 10 inches x 3.14 = 62.8 inches
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A circle with a radius of 10 inches has a circumference of 62.8 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.
Assume the tire has the shape of the circle, in that case, you just multiply the radius by 2 x pi to get the circumference.
you have to quote the diameter or radius or circumference of the circle to calculate the area. If diameter 78.53. If radius 314.15. If circumference 7.95
Circumference: 2*pi*5 = 10*pi inches