The circumference of a circle: 2*pi*radius or pi*diameter
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Divide the circumference by 2pi
the circumference is the distance around a circle. Can be found by diameter * 3.14(pi).
It would be pi x 42 feet
pi D = 10D = 10 / pi = 3.1831 inches (rounded)
To find the radius of a circle given its circumference divide the cirumference by 2 times pi