C = 2(pi)r
20 = 2(pi)r
10 = (pi)r
10/(pi) = r
3.183 inches = r
d = 2r
d = 2(3.183)
d = 6.366 inches
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The circumference of 9 inch diameter circle is about 28.27 inches.
The circumference of a circle with a 39 inch diameter is 122.52 inches.
circumference = pi * diameter so, diameter = 9/ pi = 2.86
The circumference of a circle if its diameter is 20 inches is: 62.83 inches (diameter x Pi = circumference).
The circumference of a 42-inch diameter circle is: ~131.95 inches.