the formula is π x D (3.14 x diameter)
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The circle's length (or circumference) is determined with the expression C=D(pi).
The circumference of a circle divided by its diameter = pi
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 perimeter of a circle is its circumference
The round perimeter of circle is its circumference