Circumference is the total length of the outer boundary of a circle. It can also be referred to as the perimeter of the circle. It is the product of the diameter and constant pi. You can get the circumference of a circle in units like centimeters, meters, kilometers, and so on. The circumference of a circle can be calculated by knowing either the radius or diameter of the circle.

Grade 7

Circles

7.G.B.4