A circle with a radius of 18 inches has a circumference of 113.097 inches.
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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.
Circumference = 2 x pi x radius = pi x diameter where pi = 3.1416 Diameter = circumference / pi = 36/3.1416 = 11.46
The radius of a circle with a circumference 36 inches is: 5.73 inches.
The diameter is 11.5.
circumference=pi*diameter so diameter=circumference/pi 36/pi=11.4591559