The circumference of a circle is the distance around the outer boundary or perimeter of the process. The total length of the curved line encloses the circular shape.

If the radius is given, the circumference of a circle C = 2πr

If the diameter is given, the circumference of the circle is C = πd

Explanation: If a boy runs from point 'A' and returns after completing one lap of the park, the distance he covers is called the circumference of the park.