Given the incomplete proof below, what is the missing reason for the statement in step 4?

Glven: ZABC – ZABD and AB is the

angle bisector of ZCAD

Prove: AC AD

B

Given

1. ZABC E ZABD

2. ZCABEZDAB

Given and definition of angle bisector

Reflexive property of congruence

3. AB AB

4. ΔΑΒC=ΔABD

All Chanc