The circumference of a circle with a diameter of 20 centimeters is: 62.83 cm (diameter x Pi = circumference).
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Circumference = 20*3.14 = 62.8 cm
Circumference of the circle is: pi*20'
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).
The diameter is 20.
If the diameter of a circle is 20 inches, the circumference is about 62.83 inches. (C = d x Pi).