If you know the circumference, the ration of the diameter to the circumference is π, so
diameter = circumference/π
If you have the radius,
diameter = 2 x radius
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circle diameter minus center of pitch cirlce raius
Circumference = diameter*pi
Double the Radius to Calculate the Diameter.
The radius is one -half of the diameter. It is the distance from the circle center to any point on the circumference.
Take out the diameter of the outer circle from the distance between the two. Gives you the diameter of the inner circle then pi r squared it.