Circumference = 18*pi inches
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The wheel's circumference is: 219.9 centimeters.
Circumference = 2*pi*radius or diameter*pi
Diameter = 1/2 of the circle's radius. Diameter = 2 times the square root of (the circle's area/pi) Diameter = the circle's circumference/pi
Circumference = (pi) x (diameter) = 41 pi = 128.805 inches (rounded)
20 inches measured where on the wheel? Radius? Diameter? Circumference? Width?