Chapter 4

Congruent Triangles

4.3 Proving Triangles Congruent: SSS and SAS

• Bow-tie shapes always have vertical angles.• Parallel lines usually have alternate interior angles.• Shared lines are always REFLEXIVE.

Example 1: Using SSS

Example 2: Using SAS

Example 3: Choosing a Congruence Postulate

Example 4: Determining Whether Triangles are Congruent

Checkpoint

CheckpointDecide whether the two triangles can be congruent and state which theorem you can use

4.4 Proving Triangles Congruent: ASA and AAS

Example 1: Developing Proof

Example 2: Proving Triangles Congruent

Example 3: Proving Triangles Congruent