Two lines extend from point S to create a right angle. The vertical line extends from point S through point R. The horizontal line extends right from point S through point T. A third line extends right and up from point S through point U. Which is the endpoint of a ray?

Point S

Step-by-step explanation:

A ray is a line with one end while the other end continue to extend to infinity. A ray starts at a certain point and goes off in a specific direction forever, to infinity. The point where the ray starts is confusingly called the ENDPOINT. On its way to infinity it may pass through one or more other points.

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.