Final answer:
The congruence relation between triangle FLE and triangle FUE cannot be determined without additional information about their side lengths and angles. Congruence between triangles is shown using criteria like SSS, ASA, SAS, and AAS.
Step-by-step explanation:
The question seems to be asking for the congruence relation between two triangles, specifically triangle FLE and triangle FUE. However, the details provided are insufficient to determine the correct congruence relation (i.e., SSS, ASA, SAS, or AAS) as the information about the side lengths and angles of these triangles is not provided.
In general, the congruence of triangles can be proven using various criteria:
Without additional information about triangle FLE and triangle FUE, we cannot conclusively state which congruence relation applies.