What else would need to be congruent to show that triangle abc is congruent to triangle def by aas?

To show that triangle ABC is congruent to triangle DEF by the Angle-Angle-Side (AAS) criterion, you need to establish that one pair of corresponding sides is congruent in addition to the two pairs of corresponding angles. Specifically, if you have already shown that two angles in triangle ABC are congruent to two angles in triangle DEF, you must also demonstrate that one side of triangle ABC is congruent to the corresponding side in triangle DEF that is opposite to one of the given angles.