Circumference = 22*pi feet
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A circle with a 7 foot diameter has a circumference of 22 feet (approx).
The diameter is 7
circumference of a circle = pie times the diameter = 22/7 x diameter = 22/7 x 7 inches = 22 inches
A circle with a radius of 22 inches has a circumference of 138.23 inches.
Circumference= 37.68 feet. All you have to do is multiply the diameter by pi. Same with radius. Multiply the radius by two to get the diameter then do diameter times pi.(pi= 3.14 or 22 over 7.)