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5) CONGRUENCE OF TRIANGLES
Two triangles are congruent if they are copies of each other and when superposed, they
cover each other exactly.

6) CORRESPONDING PARTS OF CONGRUENT TRIANGLES
If, under a given correspondence, two triangles are congruent, then their corresponding
parts (i.e., angles and sides) that match one another are equal.
FOR EXAMPLE:
In the above diagram ∆ABC ≅ ∆DEF
Thus, in these two congruent triangles, we have:
Corresponding vertices: A ↔ D, B ↔ E, C↔ F
Corresponding sides: AB↔ DE, BC ↔EF , AC ↔ DF
Corresponding angles: ∠A ↔ ∠D, ∠B ↔ ∠E, ∠C ↔ ∠F