Circumference = (pi) x (diameter)
Diameter = 2 x radius
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If radius equals 2.25 meters the circumference is: 14.1 meters.
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
the circumference is two times the radius, or 2r. so if the radius was 3, the circumference would be 6. if the radius was 4, the circumference is 8.