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radius=13 area=40.82 circumfrence=8.28025477707
A 128 inch circumference would imply a radius of 20.4 inches - a regular bicycle wheel, for example.
Wheel movement of one revelution equals one circumference ( in feet ). Calculate that from the given info of radius ( in inches ).
Multiply the radius by 2 x pi.
The outer radius is 20/2 = 10 inches