Geometry

Question Analysis:
Tests understanding of corresponding parts of congruent triangles (CPCTC) and vertex ordering.

Key Concept Explanation:
When two triangles are congruent, corresponding sides and angles are equal.
The order of vertices in the congruency statement determines matching parts.

Step-by-Step Solution:
ΔABC ≅ ΔDEF ⇒ AB corresponds to DE, ∠B corresponds to ∠E.
Thus:
AB = DE ⇒ DE = 5 cm (A is correct).
∠B = ∠E (not ∠F or ∠D).

Option Analysis:
A: Correct. AB and DE are corresponding sides.
B: Incorrect. ∠F corresponds to ∠C, not ∠B.
C: Incorrect. EF corresponds to BC, not AB.
D: Incorrect...