....need help on this

Answer:
ASA statement
Step-by-step explanation:
In quadrilateral ABCD, diagonal AC bisects [tex] \angle BAD[/tex] and [tex] \angle BCD[/tex] (given)
Next
[tex] In\: \triangle ABC \: and \: \triangle ADC[/tex]
[tex] \angle CAB\cong\angle CAD[/tex]
(By angle bisector property)
[tex] AC\cong AC.... (common\: side) [/tex]
[tex] \angle ACB\cong\angle ACD[/tex]
(By angle bisector property)
[tex] \therefore \triangle ABC \cong \triangle ADC[/tex]
(By ASA Statement)