the ratio is pi, which is approx 3.14159
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Pi = circumference divided by diameter
The diameter of a circle with a circumference of 2.75 inches is: 0.875 inches (circumference divided by pi = diameter).
The circumference of a circle divided by its diameter is equal to the value of pi.
The circumference of any circle is: diameter times pi The circumference of any circle divided by its diameter is the value of pi
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).