The complete congruence statement is ∆ CAB is congruent to ∆ ZXY
Congruent triangles are triangles with equal corresponding angles and equal side lengths.
The two triangles above are congruent because they have equal corresponding angles.
In the diagram given above , it can be stated that
angle C is congruent to angle Z
angle A is congruent to angle X
angle B is congruent to angle Y
Therefore, we can say that ∆ CAB is congruent to ∆ ZXY