Answer:
Angle ABD must be congruent to Angle AEC.
Explanation:
Angle: Triangles ADB and ACE share angle A in common.
Side: AD is congruent to AC.
For Triangles ADB and ACE to be congruent by the ASA Congruence Theorem, then the following must hold:
Angle: Angle ABD must be congruent to Angle AEC.