Question

which undefined term is used to define an angle? line plane point ray

Explanation:

An angle is defined as the figure formed by two rays sharing a common endpoint (vertex). Rays are undefined terms in geometry (along with point and line) and are essential for defining an angle. A line extends infinitely in both directions, a plane is a flat surface, and a point is a location, none of which directly define an angle as rays do.

Answer:

D. ray