Diameter of a circle = 2*radius
Circumference of a circle = 2*radius*pi
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A spherical surface, with its center at the given point, and its radius equal to the given distance.
They form the sphere whose center is the given point and whose radius is the given distance.
Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
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You times the radius by 2.