It is 3.18 feet, approx.
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Circumference of a circle equals Pi times the double the radius C = 2 x 3.14 x radius C= 2 x 3.14 x 20 C = 125.6 The circumference of a circle with a 20 foot radius is 125.6 feet.
Circumference = 2*Ï€*radius = 20*Ï€ feet
Circumference of a circle = 2*pi*radius or pi*diameter Area of a circle = pi*radius squared
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).
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