Question

which is the endpoint of a ray?
point r
point s
point t
point u

Explanation:

A ray has one endpoint and extends infinitely in one direction. Looking at the diagram, rays like \( \overrightarrow{SR} \), \( \overrightarrow{ST} \), and \( \overrightarrow{SU} \) all start at point \( S \), so \( S \) is the endpoint of these rays. Points \( R \), \( T \), \( U \) are the directions the rays extend towards, not endpoints.

Answer:

point S