A circle with a radius of 21 meters has a circumference of 131.95 meters.
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The radius of a circle whose circumference is 36 pi (113.1) is: 18 (circumference divided by Pi divided by 2 = radius)
The radius and diameter of a circle whose circumference is 25.12 are:r = 4d = 8
The circumference of a circle with a radius of 12.5 is 78.54 to two decimal places.
Circumference of circle: 2*pi*6 = 37.699 units to three decimal places
circumference = 2pi5 = 31.416 m rounded to 3 decimal places