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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 Checkpoint Decide 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