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If radius equals 2.25 meters the circumference is: 14.1 meters.
Circumference equals pi times radius squared, so 3.14x36=113.04 meters.
3
AL equals 416.2m2
Circumference is equal to 2 times pi times the radius. The radius is half the diameter, so pi times the diameter is also the circumference. In this case, the diameter is 3 meters so 3 times pi equals 9.42 So the circumference is about 9.42 meters.