The circumference of a circle with a diameter of 18 metres is 56.5 metres, approx.
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if a circle has an 18 meter diameter, then it has a 9 meter radius the circumference of a circle is 2(pi)r so the c. would be 2(pi)(9) which is 18pi. (another way to think of circumference is the diameter times pi)
The circumference of a 31.4-meter diameter circle is about: 98.6 meters.
A circle with a radius of 1 meter has a circumference of 6.28 meters.
The circumference of a 9.5-meter diameter circle is: 29.85 meters. (C = d x Pi)
The circumference of a circle with a diameter of 18 inches is 56.5 inches.