Geometry

Question Analysis:
This question tests the fundamental understanding of CPCTC, which states that corresponding parts (sides and angles) of congruent triangles are congruent.

Key Concept Explanation:
CPCTC applies only after proving two triangles congruent (e.g., via SSS, SAS, ASA, etc.).
It ensures all corresponding parts (sides/angles) are congruent.

Step-by-Step Solution:
Given ΔABC ≅ ΔDEF by SSS, all corresponding sides are congruent:
AB ≅ DE, BC ≅ EF, AC ≅ DF.
By CPCTC, all corresponding angles are also congruent:
∠A ≅ ∠D, ∠B ≅ ∠E, ∠C ≅ ∠F.
Thus, all options A, B, and C are correct.

Option Analysis:
A, B, C: Each is true individu...