perimeter of a circle or ellipse

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 ,[1] with:[2][3]

Circumference of a circle

where d is the diameter of the circle.

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References change

  1. "List of Geometry and Trigonometry Symbols". Math Vault. 2020-04-17. Retrieved 2020-09-24.
  2. Weisstein, Eric W. "Circle". Retrieved 2020-09-24.
  3. "Radius, diameter, & circumference | Circles (article)". Khan Academy. Retrieved 2020-09-24.

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