Two arcs are congruent if they have the same measure and they belong to or to .?

Two arcs are congruent if they have the same measure in degrees or radians, and they belong to the same circle or to congruent circles. This means that their lengths are equal, and they subtend the same central angle. Additionally, congruent arcs can be thought of as having identical properties, even if they are located in different congruent circles.