Question

Triangle ABC and DEF are congruent. Find x.

Answer 1

I can't see ur drawing. do u mind drawing it again?

Answer 2

as triangle abc is congruent to triangle def angle e of triangle DEF = angle b of triangle ABC
but then angle e and angle b should be equal

Answer 3

Use CPCTC (Corresponding Parts of Congruent Triangles are Congruent). Therefore Angle B is Congruent to Angle E. Use this relationship and the definition of congruence to solve for x.