Answer:
Step-by-step explanation:
     Statements                      Reasons
1). AB ≅ CB, AD ≅ CD        1). Given
2). BD ≅ BD                2). Reflexive Property of congruence
3). ∠BAD ≅ ∠BCD           3). Given
4). ∠ABD ≅ ∠CBD           4). Given
5). ∠BDA ≅ ∠BDC           5). Third angles theorem
6). ΔABD ≅ ΔCBD           6). SAS property of congruence of two
                            triangles