Page 3: AAS (Angle-Angle-Side) Congruence Theorem
This page focuses on the AAS (Angle-Angle-Side) congruence theorem, providing a comprehensive explanation and examples of its application in triangle congruence proofs.
Definition: The AAS congruence theorem states that if two angles and a non-included side of one triangle are congruent to two angles and a non-included side of another triangle, then the two triangles are congruent.
The page emphasizes the distinction between AAS and ASA, highlighting that in AAS, the given side is not between the two given angles but opposite to one of them.
Two detailed examples are presented to demonstrate the application of the AAS theorem:
- A proof involving an angle bisector and a given congruent angle
- A proof using parallel lines, corresponding angles, and a midpoint
Example: In the first proof, YZ bisects ∠WYX, and ∠YWZ ≅ ∠YXZ. The proof shows how to use this information along with the definition of an angle bisector to establish triangle congruence using AAS.
Highlight: The second example introduces the concepts of corresponding angles and midpoints in the context of parallel lines, demonstrating how these properties can be used in conjunction with AAS to prove triangle congruence.
Each example includes a step-by-step breakdown of the proof, listing statements and reasons for each step. This structured approach helps students understand the logical progression of a triangle congruence proof using the AAS theorem.
The page also includes a visual representation of the AAS theorem, clearly showing the relationship between the congruent angles and side in two triangles.