In a circle, the arc length is a part of the circumference.
Let L be the arc length, 'r' be the radius of the circle, and Ф be the angle in radians subtended by the arc at the center of the circle.
An "arc" is a curve connecting two points in mathematics. In general, an arc is one of a circle's parts. It basically makes up a portion of a circle's circumference. A curve includes an arc. Although it can be a part of other curved forms, such as an ellipse, an arc mostly refers to a circle.
The length of an arc is equal to radius * Ф, where Ф is in radians, is a formula that may be used to determine the arc length of a circle given its radius and central angle.