All angles can be determined:
- We can determine angle DAB because the interior angles of a triangle sum to 180, and we already know the other two angles of triangle ADB
- We can determine angle DAC, because it is the same angle as DAB, because AD is the bisector of CAB
- We can determine angle CDA, because it is supplementary with angle ADB
- We can determine angle ACD because of the sum of the interior angles of triangle ACD, of which we already know angles A and D.