MathLiveCircumference of a circle
Gives the distance around a circle from its diameter or radius. It is used whenever the perimeter of a circle needs to be found from its size.
C=\pi d=2\pi r=\tau rWhat the symbols mean
| circumference, the perimeter of the circle (same length unit as r and d) | |
| diameter of the circle | |
| radius of the circle | |
| pi, approximately 3.14159 | |
| tau, equal to 2\pi, approximately 6.28318 |
About this formula
- FieldMathematics
- TopicPlane geometry
- LevelHigh school
- Also calledcircumference of a circle formula, perimeter of a circle, circle perimeter, 2 pi r, pi times diameter, circumference formula
- SourceWikidata Q843905
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