Answer:
corresponding angles are listed in the same order
Step-by-step explanation:
Corresponding angles are listed in the same order in the triangle names. Corresponding angles are congruent.
∠D ≅ ∠Z
∠E ≅ ∠X
∠F ≅ ∠Y
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This is why you have to carefully choose the names of triangles that you say are congruent. The sequence of the letters in the name carries significant information.