The formula;
2 * Pi * Radius = circumference
Will calculate the circumference of a circle.
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find the radius of a circle with circumference of 42.1
The circumference of a circle is the length of the circle's perimeter.
circumference of a circle = 2piradiuis or diameter*pi
When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.
The radius of a circle is the distance from its centre to its circumference. If a circle has a radius of r units then the length of its circumference is 2*pi*r units.