In the given figure AD is the bisector of ∠A and AB=AC. Then △ACD and △ADB are congruent by which criterion?
SAS
In △ABC
AB = AC [Given] (equal sides )
∠BAD=∠CAD [because AD is the bisector of angle A] (equal angles)
AD is the common side (equal sides )
Thus, ΔABD≅ΔACD (SAS Congruency)