1. Geo Quiz. You have 20 min. 1. Find mABD. 2. Find mN and mP.
3. The diagram is a map showing John's house, Kay's house, and the grocery store. What is the angle the two houses make with the store?

2. Homework Questions???

3. 4.3 Congruent Triangles

4. What Standard will I learn?
What will I be able to do?
Prove triangles congruent
What Standard will I learn?
5.0 Students prove triangles are congruent

5. corresponding parts are congruent
When you write a statement such as ABC  DEF, you are also stating which parts are congruent.
Helpful Hint

6. If Δ ABC is  to Δ XYZ, which angle is  to C? Which side is  to XZ?
Ex 1
If Δ ABC is  to Δ XYZ, which angle is  to C?
Which side is  to XZ?
<C  Z
XZ  AC

7. Ex 2: A B C D E C  Are the two triangles above congruent?
If so, write a congruence statement?
Yes the triangles are congruent because all the corresponding
angles and corresponding sides are congruent. A B C D E C 

8. Theorem 4.3

9. Ex 3: find x ) )) ) 22o 22o )) 87o 87o (4x+15)o

10. Theorem 4.4 Reflexive prop of Δ  ΔABC  ΔABC. Symmetric prop of Δ 
If ΔABC  ΔPQR, then ΔPQR  ΔABC.
Transitive prop of Δ 
If ΔABC  ΔPQR & ΔPQR  ΔXYZ, then ΔABC  ΔXYZ.

11. SUMMARY

12. CLASSWORK HOMEWORK Pages 258- 262 #’s 2, 4, 6, 10 – 20 even, 39