Circumference of any circular entity = (pi) x (diameter) = (pi) x (2 x radius)
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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.
formula for circumference is 2(pi)(radius) therefore: 10=2(pi)(radius) solving: radius = 10 / (2 pi) radius = 1.59
A circle with a radius of 10 m has a circumference of 62.83 m.
Circumference = 2 x pie x radius Therefore, radius = 10/2/pie =1.6
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.