we are given
ΔABC and ΔDEF are congruent
we can draw triangles
corresponding sides and angles are always equal
so,
∠B is corresponding to ∠E
so, ∠B is congruent to ∠E
AC is corresponding to DF
so, AC is congruent to DF
so,
Answers are:
∠B is congruent to ∠E
AC is congruent to DF