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)
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The circumference of a circle with a diameter of 18 metres is 56.5 metres, approx.
The circumference of a circle with a diameter of 18 inches is 56.5 inches.
The circumference of a circle is determined by multiplying the diameter (d) by the number pi. Therefore, the circumference of a circle with a diameter (d) of 18 feet is 18pi or 18x3.14159265358979323846... Roughly 56.54866776461627829228.
56.548667764616276 circumference = PI * diameter
Circumference of a circle: 2*pi*radius or diameter*pi