Since π is the ratio between the diameter and the circumference,
Diameter = 72 in /π = 22.92 in
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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).
If the circumference of a circle is 75 inches, the diameter is: about 23.87 inches. (diameter = circumference divided by pi).
The circumference of a circle with a diameter of 3 inches is 9.425 inches.