Probably a cog, are you doing PHSchool science?
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Circumference is equal to the diameter multiplied by pi, or 3,14. Multiply 65 x 3.14.
Assuming what you're asking is for the circumference (distance around the entire wheel) the formula is r*2*pi. In this case the circumference is roughly 157 inches.
Multiply the radius by 2 x pi.
A 128 inch circumference would imply a radius of 20.4 inches - a regular bicycle wheel, for example.
94/pi = 29.9211293 cm