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A circle with a radius of 1 meter has a circumference of 6.28 meters.
area of a circle = pi * radius² = 1 radius = √(1/pi) circumference = 2pi * radius = 2pi * √(1/pi) = 3.5449077
Circumference of the circle is: 2 times pi
If a circle circumference is 30 the radius is: 4.77
The circumference of a circle with a 2pi radius is: 39.58