If radius equals 2.25 meters the circumference is: 14.1 meters.
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If a circle's radius is 2.4 its circumference is: 15.1
The circumference of a circle if the radius is 12 equals about 75.4
The radius is 10.5
Circumference = (pi) x (diameter) Diameter = 2 x radius
9. Circumference equals 2 times Pi times the radius. C=2(pi)r. "r" for radius. So if your circumference is 18 times pi, then you do 18 divided by 2, which gives you a radius of 9.