A circle with a circumference of 11.25 has a diameter of: 3.581
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Diameter of a circle = circumference/pi
If a circle has a diameter of 14, the circumference is: 43.98.
The diameter of a circle with a circumference of 18 is: 5.73
If a circle has a circumference of 26 the diameter is: 8.276
Pi is, by definition, the ratio of a circle's circumference to its diameter. It follows that the circumference of any circle is pi times its diameter.