In the provided geometric diagram, we are asked to identify two congruent angles. Upon inspecting the diagram, we can observe markings that indicate which angles are congruent.

• Angle $\angle PQR$ is marked congruent to $\angle OPN$ with the curved arc notation near points $P$, $Q$, and $O$.
• These two angles are congruent because they have the same arc marking.

Therefore, the correct answer is:

$\angle PQR \text{ is congruent to } \angle OPN.$

Would you like further details or explanations on this?

Here are some related questions to expand your understanding:

1. How do you determine congruent angles in a diagram without markings?
2. What is the significance of using arc marks to denote angle congruence?
3. What properties of quadrilaterals can help in identifying congruent angles?
4. Can two angles in different shapes be congruent? If so, how?
5. How can you use congruent angles in solving for unknown angle measures?

Tip: In geometry, congruent angles are those that have exactly the same measure, regardless of the lengths of the sides forming them. Always look for symbols or markings that indicate congruence.