Explain how you can use sss, sas, asa, or aas with the definition of congruent triangles to prove that

You can use SAS since you know one pair of sides are congruent and AC splits them so those must make those sides equal. And since those sides, DC and BC, are congruent, the angles must be as well. You can use numbers to prove the angles of D and B or just use that when 2 sides and an angle are congruent, the 3rd side must be congruent.

The answer is something i don’t know

Idon’t understand what you’re asking..