2 x p x radius where p is a mathematical constant equal to about 314159. It is another name for the perimeter of a circle. Circumference of circle p x Diameter of circle.
The formula for working out the circumference of a circle is.
The formula to find the circumference when radius is given is. If you know the diameter or radius of a circle you can work out the circumference. Plug the circumference into the formula. A p R² p 14² 615752 cm².