Geometry

Question Analysis:
This question involves the concept of triangle congruence and CPCTC (Corresponding Parts of Congruent Triangles are Congruent).
The main focus is on identifying corresponding angles in congruent triangles.

Key Concept Explanation:
CPCTC states that if two triangles are congruent, then all their corresponding sides and angles are also congruent. Here, △ABC ≅ △DEF, which means:
∠A corresponds to ∠D
∠B corresponds to ∠E
∠C corresponds to ∠F
Since we are given ∠A = 40° and ∠B = 60°, and we know the triangles are congruent, the corresponding angles in △DEF must be equal.

Step-by-Step Solution:
Identify the given information:
△ABC ≅ △DEF
∠A = 40°
∠B = 60°
Find the corresponding angles in △DEF:
∠A corresponds to ∠D, so ∠D = 40°
∠B corresponds to ∠E, so ∠E = 60° (answer)

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