Circumference: 2*pi*5 = 10*pi inches
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If a circle has a diameter of 10 inches across it then its radius is half of 10 inches which is 5 inches.
Diameter = 2 x radius = 5 inches.
A circle's radius is always 1/2 of the circle's diameter, so the radius of a circle of 5-inch diameter is 2-1/2 inches.
r = ~0.8 inches.
The diameter is twice the radius so a circle with a radius of 2.5 will have a diameter of 5.