π is the ratio between the circumference and diameter of a circle, 

. Its numerical value is often rounded to 3.14. Discover more about π in this video. 

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

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

Length of the boundary of a circle or ellipse

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

Mathagon

The Number π

Circumference of a Circle

Area of a Circle

Length of a Circular Arc

Area of a Circular Sector

Circles

Definition

π is the ratio between the circumference and diameter of a circle, π = C/d. Its numerical value is often rounded to 3.14. Discover more about π in this video. 

What Is the Number π?