Warm-Up (#33 p.191)

4.3 Triangle Congruence by ASA and AAS

Learning Target

I can show two triangles are congruent using AAS or ASA

Vocabulary

Angle Side Angle (ASA): If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent.

ASA Example

PMO ≅ NMO

Vocabulary

Angle Angle Side (AAS): If two angles and a non included side are congruent to two angles and the corresponding non included side, then the triangles are congruent.

AAS Example

WVY ≅ ZVY

Practice

On your 4-3 worksheet, lets do problems 1-9

Practice

On your 4-3 worksheet, lets do problems 12-14

Practice Together

Proofs – #10 and #11 on your 4-3 worksheet together

Recap Questions

• Do you know what AAS and ASA mean?

• Do you know how to prove two triangles congruent using AAS or ASA?

• Do you remember SAS and SSS?

• Can you provide reasoning in a proof?

CHALLENGE: Can you write a proof?

• Homework p. 197 – 198 #1-18 all

• HEADS UP: There will be a quiz this Thursday on 4.1 – 4.3