circumference = pi * diameter
so, diameter = 9/ pi = 2.86
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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.
If the diameter of a circle is 9 the circumference is: 28.3
The circumference of a 42-inch diameter circle is: ~131.95 inches.
The circumference of a 24-inch diameter circle is about 75.4 inches. (C = d x Pi)