Answer:
Δ ABC ≅ Δ XYZ by SAS criteria. 
Explanation:
Two triangles are there, one is Δ ABC and the other is Δ XYZ. 
Now, given that AB = XY and BC = YZ. 
Again it is given that ∠ ABC = ∠ XYZ 
So, we can say that Δ ABC and Δ XYZ are congruent or Δ ABC ≅ Δ XYZ by Side-Angle-Side or SAS criteria. 
So, it is not by the Side-Side-Side i.e. SSS criteria. (Answer)