Circumference

In geometry, circumference is the distance around a closed curve; for example, a circle. It is a special kind of perimeter. The length of the circumference of a circle is often written as , with:

where d is the diameter of the circle.

 Related pages 

 Radius
 Pi

 References 

 Other websites 

 Numericana - Circumference of an ellipse
Circumference of a circle With interactive applet and animation

Category:Geometry