C = 2 * r * pi = d * pi
(r - radius, d - diameter)
in this case:
C = 540*pi
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Diameter of a circle = circumference/pi
If the circumference of a circle is 17.27, the diameter is: 5.5
The diameter of a circle with the circumference of 3.25 is: 1.034
If a circle's diameter is 10, the circumference is: 31.416
The circumference of a circle with a diameter of 14 is: 43.982