Question

Which is another way to name AngleUST?

AngleTSR
AngleTSU
AngleUSR
AngleUTS

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.

Answer 1

Angle TSU.

Reason: Angle UST has vertex S, so any equivalent name must have S as the middle letter and use the same two rays SU and ST. TSU (T-S-U) meets that. The others either use a different vertex (UTS) or involve SR (TSR, USR), which are different rays.