Final answer:
The geometric relationship indicated by congruent angles TNR and TRN is d) Vertical angles.
Step-by-step explanation:
The geometric relationship indicated by congruent angles TNR and TRN is d) Vertical angles.
Vertical angles are formed by a pair of intersecting lines or rays. They are opposite to each other and share the same vertex, but they are not adjacent. In this case, angle TNR and angle TRN are vertical angles because they are congruent and have a common vertex at N.