1. Aim:
How do we prove triangles congruent using the Angle-Angle-Side Theorem?
Do Now:
In each case, which postulate can be used to prove the triangles congruent? 3) 1) 2) )) ) ( ((
S.A.S.
S.S.S.
A.S.A. 4) (( (
A.A.S. Theorem
Theorem #20: Angle-Angle-Side Theorem (A.A.S.) If two angles and the non-included side are congruent to two angles and the corresponding non-included side of another triangle, the two triangles are congruent.

2. Ex: A.A.S Theorem
In each case, state whether A.A.S. be used to prove the triangles congruent. 1) )) ( (( 2) (  X 3) ) 
Geometry Lesson: Angle-Angle-Side Theorem

3. G M T R Ex: A.A.S. Theorem Given: Prove: Statement Reason 1) 2) 3) 4)5) 6) 7)
Given
Def. perpendicular lines
Given
Reflexive Postulate
A.A.S. Theorem
C.P.C.T.C.
Geometry Lesson: Angle-Angle-Side Theorem

4. S T R D E Ex: 1,2,3 A.A.S. Theorem: R M B P 1) Given: Prove: 2) Given:K P V M
3) Given:
Prove:
Geometry Lesson: Angle-Angle-Side Theorem

5. Ex: 4, 5 A.A.S. Theorem:
Geometry Lesson: Angle-Angle-Side Theorem