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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
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Continue Learning about Geometry
What is the circumference of a circle with an diameter of 6cm?
The circumference of a circle with a diameter of 6cm is about 18.85cm
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