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# Arc

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An **arc** is a part of a circle. An arc is a curved line. The curve of an arc is constant and does not change (that is, an arc has constant curvature). It sometimes is portrayed as a dotted line.

In a circle, the arc from point A to point B is written as [math]\overset{\frown}{AB}[/math].^{[1]}^{[2]} We call the length of an arc an arc length. For an arc on a circle with radius *[math]r[/math]* subtended by an angle [math]\theta[/math], its arc length is precisely [math]r\theta[/math].^{[3]}

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## References

- ↑ "List of Geometry and Trigonometry Symbols" (in en-US). 2020-04-17. https://mathvault.ca/hub/higher-math/math-symbols/geometry-trigonometry-symbols/.
- ↑ "Arc - Math word definition - Math Open Reference". https://www.mathopenref.com/arc.html#:~:text=An%20arc%20is%20a%20portion,sometimes%20called%20a%20circular%20arc..
- ↑ Weisstein, Eric W.. "Arc" (in en). https://mathworld.wolfram.com/Arc.html.