If that's a circle, the diameter is 13.84648 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 42-inch diameter circle is: ~131.95 inches.
The diameter of a circle with a 27 inch circumference: 27/pi = 8.594 inches rounded