Label each pair of triangles with the postulate or theorem that proves the triangles are congruent.

Answer:
We can conclude that Δ ABC ≅ Δ DEF by SSS postulate.
Step-by-step explanation:
Δ ABC and Δ DEF are congruents because:
1. Their sides AB and DE are equal (9 units = 9 units)
2. Their sides BC and EF are equal (5 units = 5 units)
3. Their sides AC and DF are equal (10 units = 10 units)
Now, we can conclude that Δ ABC ≅ Δ DEF by SSS postulate.