Arc

In a circle, the arc from point A to point B is written as ${\displaystyle {\overset {\frown }{AB}}}$.[1][2] We call the length of an arc an arc length. For an arc on a circle with radius ${\displaystyle r}$ subtended by an angle ${\displaystyle \theta }$, its arc length is precisely ${\displaystyle r\theta }$.[3]
1. "List of Geometry and Trigonometry Symbols". Math Vault. 2020-04-17. Retrieved 2020-09-24.{{cite web}}: CS1 maint: url-status (link)