Question

what defines an arc in a circle? the entire circumference of the circle; a line segment inside the circle; the part of a circle lying between two points on the circle; a line segment that touches the circle at one point

Explanation:

An arc is a portion of the circle's circumference, specifically the curve connecting two distinct points on the circle. The entire circumference is the full circle, not an arc. A line segment inside the circle is a chord, and a line segment touching the circle at one point is a tangent.

Answer:

The part of a circle lying between two points on the circle