What else would need to be congruent to show abc is congruent to xyz by SAS given ab congruent xy and bc congruent yz?

To show that triangle ABC is congruent to triangle XYZ by the Side-Angle-Side (SAS) criterion, we also need to establish that the included angles are congruent. Specifically, we need to demonstrate that angle ABC is congruent to angle XYZ. With the two pairs of congruent sides (AB ≅ XY and BC ≅ YZ) and the included angle congruence, SAS can be satisfied.