Multiply the diameter by Pi:
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Multiply the diameter by pi to find the circle's circumference
The circumference of a circle with a diameter of 18 inches is 56.5 inches.
circumference = 4*pi inches
The circumferecne of a circle with diameter d is pi*d So diameter = circumference / pi = 36/pi = 11.46 inches. Radius = diameter/2 = 5.73 inches.
Multiply the diameter by Pi (about 3.1416). The result is the circumference:3 x 3.1416 = 9.4248 inches circumference