1. CPCTC uses congruent triangles to prove corresponding parts congruent.
SSS, SAS, ASA, AAS, and HL use corresponding parts to prove triangles congruent.
CPCTC uses congruent triangles to prove corresponding parts congruent.
Prove the triangles are congruent FIRST: use CPCTC LAST.
Remember!

2. Example 1
Given: YW bisects XZ, XY  YZ.
Prove: XYW  ZYW ZW Z

3. Reflexive Property of 
Example 2
Prove: PQ  PS
Given: PR bisects QPS and QRS.
PR bisects QPS
PR bisects QRS
Given
Def. of  bisector
RP  RP
Reflexive Property of 
∆PQR  ∆PSR
PQ  PS
ASA
CPCTC
Given
QPR  SPR
QRP  SRP
Def. of  bisector

4. Example 3 Given: A(2, 3), B(5, -1), C(1, 0)
D(-4, -1), E(0, 2), F(-1, -2)
Prove: A  D
Statements
Reasons
1. A(2, 3), B(5, -1), C(1, 0)
D(-4, -1), E(0, 2), F(-1, -2) 1.
2. AB = DE =
BC = EF =
AC = DF = 2. 3.
3. Definition of Congruence 4. 5.

5. Your Turn! Workbook pg 171 #2

6. 4 – 5, 4 – 6, 4 – 7 Assignment from Textbook
pg254 #7, 13
Pg264 – 265 #6, 13
pg 270 – 271 #3, 8 (Honors also do #12)
Use the template to fill in all problems except pg 270 #12 as flowchart proofs
Honors: do pg270 #12 as a two-column proof on a separate piece of paper.
Must write down the whole proof, not just the missing blanks, to get full credit.