94.2 centimeters
30 cm times pi
30*3.141592 = 94.24776
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The circumference of a circle with a diameter of 30 centimeters is: about 94.25 cm. You can easily do this calculation for other circles by multiplying the diameter by Pi (about 3.1416).
C.94.2 centimeters
If the circumference of a circle is 30 cm its diameter is: 9.549 cm
The circumference of a 30-foot diameter circle is: 94.248 feet.
circumference = 30*pi feet