1. Warm Up 1. Name all sides and angles of ∆FDE. 2. What is true about  K and  L? Why? 3. What does it mean for two segments to be congruent?

2. Warm Up 1. Name all sides and angles of ∆FDE. 2. What is true about  K and  L? Why? 3.What does it mean for two segments to be congruent? They all have the same measurement: angles and side lengths are the same. ∠FDE, ∠DEF, ∠EFD Angles K and L are congruent Because of the Third angles theorem.

3. 4.3: Assignment p. 234 #13-18, 23-26 and 38-45

4. 4.3: Congruent Triangle Objectives: To apply properties of congruent triangles. To prove triangles congruent by using the definition of congruence. Supplies: Math Notebook notes

5. 4.3: Congruent Triangle Diagram Corresponding Angles Corresponding Sides B A C F E D ∠ABC≅∠FDE ∠BCA≅∠DEF ∠CAB≅∠EFD AB length of the side AB=FD

6. 4.3: Congruent Triangle Consecutive Vertices Parts in the same location of two different figures. Congruent Triangles: 3 pairs of  corresp. sides. 3 pairs of  corresp. Angles.

7. 4.3: Assignment p. 234 #13-18, 23-26 and 38-45