Circumference = pi*diameter
So C = pi*18 = 56.5 units (approx).
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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.
The circumference of a circle with a diameter of 18 metres is 56.5 metres, approx.
56.548667764616276 circumference = PI * diameter
Circumference of a circle: 2*pi*radius or diameter*pi