1. Proving Triangles Congruent

2. The Congruence Postulates
SSS correspondence
ASA correspondence
SAS correspondence
AAS correspondence
SSA correspondence
AAA correspondence

3. Row Game Practice! -Each row is a team
-Everyone gets a white board and marker
-I will check first person’s answer. If it’s correct, your team gets 7 points!
-If first person’s answer is not correct, I will check everyone else’s in your row. Each correct answer is 1 point for your team.
-Switch seats so everyone gets a chance to be the 1st person
-Winning team gets candy!

4. Name That Theorem
(when possible)
SAS
ASA
SSA
SSS

5. Name That Theorem
(when possible)
AAA
ASA
SSA
SAS

6. SAS SAS SSA SAS Name That Theorem and the property that
helps you get there
(when possible)
Vertical Angles
Reflexive Property
SAS
SAS
Vertical Angles
Reflexive Property
SSA
SAS

7. SAS SAS AAS Name That Theorem and the property that
helps you get there
(when possible)
Reflexive Property
SAS
SAS
Alt. Int. Angles Theorem
AAS
Perpendicular Bisector

8. Find the values of a and b that yields congruent triangles

9. Quick Review!
Given ABC is a triangle, find the measure of each angle. Then classify the triangle by its angles and sides.
mA = 2x + 5°, mB = 3x – 15° and m C = 4x + 1o°
Right Isosceles

10. Quick Review!
Find the measure of the exterior angle.
120°

11. Getting into formal proofs…
We will now use one of the 6 theorems to complete some formal proofs that show whether or not 2 triangles are congruent.

12. What theorem completes this proof?

13. What theorem completes this proof?

14. Try one on your own! What theorem completes this proof?

15. Homework 2 Assignments: Textbook pg. 271 #27-28, 31
Triangle Congruence Theorems WS