If the radius of a circle is 2 meters, the circumference will be 12.57 meters. (C = r x 2 x Pi)
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The circumference of a circle with a radius of 8 meters is: 50.27 meters (r x 2 x Pi = circumference).
A circle with a radius (d/2) of 9 meters has a circumference of 56.5 meters.
Circumference = 2*pi*r = 125.66 metres
2*pi*44.7 = 280.858 meters
It will have a radius of 2 because 2*pi*radius is the circumference of the circle.