Multiply the diameter by the value of Pi - and you'll have your answer !
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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.
A circle with a radius of 18 inches has a circumference of 113.097 inches.
Circumference = 2 x pi x radius = pi x diameter where pi = 3.1416 Diameter = circumference / pi = 36/3.1416 = 11.46
Area of the circle: pi*6 squared = 36*pi square inches
The radius is 18 inches (r = d/2).