Question

which is another way to name $angle ust$?$\bigcirc$ $angle tsrLXB0\bigcirc$ $angle usr$$\bigcirc$ $angle uts$

Explanation:

When naming an angle with three letters, the middle letter must be the vertex of the angle. For $\angle UST$, the vertex is $S$. We can swap the order of the two non-vertex letters (U and T) while keeping the vertex $S$ in the middle to get an equivalent angle name.

Answer:

B. $\angle TSU$