C=2 pi d. 2x diameter times pi. pi - about 3.14159... If the diameter is 6.3km the the circumference is 2*6.3*3.14159 = 39.584km. If radius is 6.3km then 79.168km.
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The perimeter of a circle is its circumference
The round perimeter of circle is its circumference
The perimeter of a circle is its circumference
The distance around a circle is its circumference
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.