If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).
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Circumference of the circle is: pi*20'
The circumference of a circle with a diameter of 20 centimeters is: 62.83 cm (diameter x Pi = circumference).
The diameter is 20.
If the diameter of a circle is 20 inches, the circumference is about 62.83 inches. (C = d x Pi).
circumference = π x diameter => diameter = circumference ÷ π ~= 20ft ÷ 3.14 ~= 6.37 ft