The circumference of a circle with a diameter of 6cm is about 18.85cm
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The circumference of a circle = 2*pi*radius or diameter*pi
Circumference of a circle is 2πr (two x Pi x the radius of the circle)Pi is usually taken as 3.14 for simple calculations - see here http://en.wikipedia.org/wiki/Pi for a longer determination of Pi.The radius is half the diameter.Thus, a circle with a diameter of 6cm has a circumference of 18.84cm
If the diameter of a circle is 9 the circumference is: 28.3
If a circle has a diameter of 5 the circumference is: 31.4
The circumference of a circle with a diameter of 51m is: 160m