21.5/pi = 6.84 units of length, approx.
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Diameter of a circle = circumference/pi
The circumference of a circle with diameter of 4.4 is about 13.82
The circumference of a circle if the diameter is 25.8 is: 81.1
The circumference of a circle with a diameter of 14 is: 43.982
The diameter of a circle with the circumference of 3.25 is: 1.034