62.8 inches.
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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'
Circumference of a circle = 2*pi*radius or pi*diameter
The area of circle with a circumference of 20 is: 31.83 units squared.
The circumference of a circle with a diameter of 20 centimeters is: 62.83 cm (diameter x Pi = circumference).