Final answer:
To prove angle B is congruent to angle C, we can typically apply triangle congruence postulates like SAS or ASA with the given congruences, but a diagram and additional context are necessary for a complete proof.
Step-by-step explanation:
The task here is to prove that angle B is congruent to angle C using the given information about the congruences of line segments and angles.
The geometry principle that is applied in this situation typically involves properties of triangles and congruence, such as the Side-Angle-Side (SAS) postulate or the Angle-Side-Angle (ASA) postulate for proving triangle congruency. However, without a diagram or additional context, it is challenging to provide a step-by-step proof.
Nevertheless, the given congruences suggest that triangles ABD and ACE may be congruent by ASA, implying the corresponding angles B and C would then also be congruent.