The formula to find the circumference is 2r x pi, 2(4)x3.14=25.12. The circumferencence of that circle is about 25.12 meters
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The circumference of a circle with a radius of 5 meters is: about 31.42 meters.
The circumference of a circle with a radius of 31 meters is about 194.8 meters.
The circumference of a circle if the radius is 6.25 meters is: 39.3 meters.
If radius equals 2.25 meters the circumference is: 14.1 meters.
The circumference of a circle with a radius of 12 meters is: 75.4 meters (r x 2 x Pi = circumference).