Given the incomplete proof below, what is the missing reason for the statement in step 4?
Given: ZABC - ZABD and AB is the
angle bisector of CAD
Prove: AC AD
B
D
Given
1. ZĀBC = ABD
2. ZCABZDAB
3. ABAB
4. A ABC ZA ABD
Given and definition of angle bisector
Reflexive property of congruence
A.AAS
B.SAS
C.ASA
D.CPCTC
