2. Two geometric figures with
exactly the same size and
The Idea of a CongruenceThe Idea of a Congruence
3. How much do youHow much do you
need to know. . .need to know. . .
. . . about two triangles
to prove that they
4. In Lesson 4.2, you learned that if all
six pairs of corresponding parts (sides
and angles) are congruent, then the
triangles are congruent.
Corresponding PartsCorresponding Parts
∆ABC ≅ ∆
1. AB ≅ DE
2. BC ≅ EF
3. AC ≅ DF
4. ∠ A ≅ ∠ D
5. ∠ B ≅ ∠ E
6. ∠ C ≅ ∠ F
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