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 ${\displaystyle C}$,^[1] with:^[2][3]

${\displaystyle C=\pi d}$

Circumference of a circle

where d is the diameter of the circle.

Related pages

• Radius
• Pi