If a circle's radius is 2.4 its circumference is: 15.1
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Circumference is pi times diameter. If the radius is 24, the diameter (twice the radius) is 48, making the circumference 48pi, or approximately 150.72 units.
If radius equals 2.25 meters the circumference is: 14.1 meters.
The circumference of a circle if the radius is 12 equals about 75.4
The radius is 10.5
Circumference = 2*pi*radius = 150.80 units.