In the diagram, lines $\overline{PR}$ and $\overline{SU}$ are parallel. Given that alternate interior angles are formed when a transversal crosses two parallel lines, we need to identify such pairs from the diagram.

The transversal here is line $\overline{QT}$, which intersects both parallel lines $\overline{PR}$ and $\overline{SU}$.

Alternate interior angles are on opposite sides of the transversal and between the two parallel lines.

From the diagram:

• $\angle PQT$ is on the upper side of the transversal between the parallel lines.
• $\angle UTV$ is on the opposite side of the transversal between the same parallel lines.

Therefore, the alternate interior angles are: $\boxed{\angle PQT \text{ and } \angle UTV}$

Would you like more details or have further questions? Here are some related questions:

1. How can you distinguish between alternate interior angles and corresponding angles?
2. Why are alternate interior angles always congruent when the lines are parallel?
3. Can you explain how a transversal forms different types of angles when intersecting parallel lines?
4. What are some real-life applications of alternate interior angles?
5. Could you determine other pairs of angles in this figure (e.g., corresponding or vertical angles)?

Tip: When two lines are parallel, the alternate interior angles are congruent, making this property useful in various geometric proofs and constructions.