Circumference of a circle = 2*pi*radius or diameter*pi
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Circumference = 2(pi)r if diameter = 18ft then the radius is 9ft, so: Circumference = 2(pi)9 = 56.54ft =] -ray
36 feet.
The perimeter of a circle is its circumference
The round perimeter of circle is its circumference
The perimeter of a circle is its circumference