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2024-04-19T19:48:51Z

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[[File:Circle-withsegments.svg|Circle-withsegments|thumb]] [[File:Pi-unrolled-720.gif|Pi-unrolled-720|thumb|left]] [[File:2pi-unrolled.gif|2pi-unrolled|thumb|left]] [[File:Ellipses_same_circumference.png|Ellipses same circumference|thumb]] '''Circumference''' is the linear distance around the edge of a closed curve or circular object. The concept of circumference is most commonly associated with circles and is a fundamental aspect in the study of [[geometry]]. The circumference of a circle can be calculated using the formula \(C = 2\pi r\) or \(C = \pi d\), where \(C\) represents the circumference, \(r\) is the radius of the circle, and \(d\) is the diameter of the circle. The constant \(\pi\) (pi) is a mathematical constant approximately equal to 3.14159, representing the ratio of a circle's circumference to its diameter.

== Calculation ==
The calculation of the circumference is crucial in various fields, including [[mathematics]], [[engineering]], and [[physics]]. In mathematics, understanding the properties of circles and their circumferences is essential for solving problems related to the geometry of circles and circular objects. In engineering and physics, the concept of circumference is applied in designing mechanical parts, analyzing circular motion, and calculating the properties of celestial bodies, among other applications.

== Applications ==
The concept of circumference is not limited to theoretical calculations but has practical applications in everyday life. For example, measuring the circumference of objects is necessary in fields such as [[construction]], where accurate measurements are crucial for materials fitting correctly. In sports, the circumference of balls used in games like [[football (soccer)|soccer]], [[basketball]], and [[tennis]] is regulated to ensure fair play and consistency in the game.

== Related Concepts ==
Several related concepts are essential for a comprehensive understanding of circumference. These include:

- [[Area]]: The space enclosed within the boundary of a circle, calculated as \(A = \pi r^2\).
- [[Diameter]]: The longest straight line that can be drawn through the center of a circle, connecting two points on its boundary. The diameter is twice the radius.
- [[Radius]]: The distance from the center of a circle to any point on its boundary. The radius is half the diameter.
- [[Pi (\(\pi\))]]: A mathematical constant representing the ratio of a circle's circumference to its diameter.

== See Also ==
- [[Geometry]]
- [[Circle]]
- [[Pi]]
- [[Area of a circle]]

[[Category:Geometry]]
[[Category:Mathematical concepts]]

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Circumference - Revision history

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