39 inches / pi = 12.4 inches
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The circumference of a circle that has a diameter of 35 inches is 109.96 inches.
The circumference of a circle with a diameter of 3 inches is 9.425 inches.
If the circumference of a circle is 28 inches the diameter is: 8.913 inches (circumference divided by Pi = diameter).
If a circle has a diameter of 12.8 inches its circumference is: 40.21 inches (circumference = diameter x Pi).
The circumference of a circle if its diameter is 20 inches is: 62.83 inches (diameter x Pi = circumference).