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Geometry Section 4.2 Apply Congruence and Triangles Congruent figures In two congruent figures, all the parts of one figure are congruent to the corresponding parts of the other. Third Angles Theorem If two angles of one triangle are congruent to two angles of another triangle, then the third angles are also congruent 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 Examples Page 228 #3, 11, 15, 19 Assignment Section 4.2 Page 228 Problems #4, 5-10, 12, 14, 16, 20, 26