Answer
△TRK and △TUK are congruent by the definition of congruent triangles
Work Step by Step
Sides:
TR TU - given
TK TK - Reflexive Property of Congruence
RK UK - given
Angles:
RTK UTK - given
TKR TKU - Theorem 4-1 Congruent angles
R U - given
△TRK ≅ △TUK by the definition of congruent triangles