Answer:
HL
Step-by-step explanation:
We are dealing with triangle DAB and CBA.
Angles DAB and CBA are right angles making the triangles right triangles.
Side AB is congruent to side BA. That is a leg of each of the two triangles.
Side DB is congruent to side CA. Tat is a leg of each triangle.
The triangles are congruent by HL.
