circumference of a circle = 2piradiuis or diameter*pi
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As for example when constructing a round-about on a road you'll need to know its perimeter which is the circumference of a circle.
So that you can find the circumference of a circle.
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.
find the radius of a circle with circumference of 42.1