Use the following formula to figure diameter when the circumference of a circle is known: Circumference = Pi x Diameter 20 = 3.1415927 x D D = 6.366
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Divide 20 by the value of Pi and you'll have your answer. (It's more than 6, but less than 6.5)
If the diameter of a circle is 20 inches, the circumference is about 62.83 inches. (C = d x Pi).
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).
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).
Circumference of a circle = 2*pi*radius or pi*diameter