1. Apply Congruence and Triangles
Geometry Section 4.2
Apply Congruence and Triangles

2. Congruent figures
In two congruent figures, all the parts of one figure are congruent to the corresponding parts of the other.

4. Third Angles Theorem
If two angles of one triangle are congruent to two angles of another triangle, then the third angles are also congruent

5. Properties of Congruent Triangles
Reflexive Property of Congruent Triangle
For any triangle ABC: ΔABC = ΔABC
Symmetric Property of Congruent Triangles
If ΔABC = ΔDEF then ΔDEF = ΔABC
Transitive Property of congruent triangles
If ΔABC = ΔDEF and ΔDEF = ΔJKL then ΔABC = ΔJKL

7. Examples
Page 228 #3, 11, 15, 19

8. Assignment
Section 4.2
Page 228
Problems #4, 5-10, 12, 14, 16, 20, 26