Circumference of the circle is: 2 times pi
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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
0.5
it is 1254.90222
The radius is 1 (0.999) unit.