1. Bell ringer
On a sheet of paper, draw and label two congruent triangles. Your triangles should be oriented differently (example: not facing the same direction).
Use marks to indicate congruent segments and congruent angles (must mark 3 congruent sides and 1 congruent angle)

2. Homework Review

4. It turns out that in certain cases all you need are three pairs of congruent parts to know that two triangles are congruent.

5. 2.4 Triangle Congruence
The following triangle congruent postulates guarantee that 2 triangles are congruent
2 angles and the side between the angles are congruent
Angle-side –angle (ASA)

6. Side-angle-side (SAS)
Two sides and an angle between the sides are congruent

7. 3 sides of the triangle are congruent
Side-side-side (SSS)
3 sides of the triangle are congruent
Two angles and the side not between the angles
Angle-angle-side (AAS)

8. Does not prove triangle congruence
Angle-angle-angle (AAA)
3 angles are congruent
Both triangles have 60 degree <‘s but the side lengths are all different

9. 1. Not Enough Information 2. Yes, SAS 3. Yes, ASA or AAS
Are the triangles congruent?
If yes, state which triangle congruence postulate guarantees that the triangle are congruent.
1. Not Enough Information
2. Yes, SAS
3. Yes, ASA or AAS

10. Finish Cornell Notes (good summary)
Homework
Finish Cornell Notes (good summary)