1. 4-3: Congruent Triangles
Objective: Identify congruent triangles, and name & label corresponding parts of congruent triangles.

2. Congruent Figures have the same shape and the same size.

3. Ex. 1 Congruence Statement: Corresponding Sides Corresponding Angles
Other Congruence Statements:

4. Corresponding parts of congruent triangles are congruent. “CPCTC”

5. Ex. 2:

6. Homework
Day 1:
4.2A
#1 - 2,

7. Properties of Congruence
Reflexive Property:
Symmetric Property:
Transitive Property:

8. Third Angles Theorem – If two angles of one triangle are congruent to 2 angles of a 2nd triangle, then the 3rd angles are congruent

9. Ex. 3: Determine if the triangles are congruent.

11. Homework Day 2: 4.2A #16 - 19 4.2B # 8 - 10 Day 3: 4.2B #13
4.3C #2-9, 12

12. Proof - a logical arrangement of facts that establishes another truth
ALWAYS begin a proof with what you know…
a.k.a. “given” information
Organized into two numbered columns, as pictured below.
Statements
Reasons

14. Statements
Reasons