The circumference of a circle can be calculated with two different formulas, 

. Learn how these formulas work by watching this video.

How Do You Calculate the Circumference of a Circle?

The circumference of a circle can be calculated with two different formulas, C = 2πr and C = πd. Learn how these formulas work by watching this video. 

Length of the boundary of a circle or ellipse

A set of points that has the same fixed distance from a point, called the center of the circle.

Any line segment that passes through the center of a circle whose endpoints lie on the circumference

The ratio of a circle’s circumference to its diameter. Its value is approximately 3.14, andits symbol is the Greek letter \pi

Any line segment from the center of a circle to its circumference