1. Answers: When they have the same measure or are marked
OBJECTIVE:
Given two or more figures, students will identify whether they are congruent, list corresponding parts, and write congruence statements.
Answers:
When they have the same measure or are marked
congruent in a diagram.
45
Transitive property

2. Opener E B Name the triangle D that is a: A 1. Translation of ΔABC? F
2. Reflection
of ΔABC?
3. 90o Rotation
of ΔABC?

3. Opener E B Name the triangle D that is a: A 1. Translation of ΔABC? F
2. Reflection
of ΔABC? A'
A"
3. 90o Rotation
of ΔABC? C'

4. Opener E B Name the triangle D that is a: A 1. Translation of ΔABC? F
2. Reflection
of ΔABC? A'
A"
3. 90o Rotation
of ΔABC? C'

5. Opener E B Name the triangle D that is a: A 1. Translation of ΔABC? F
2. Reflection
of ΔABC? A'
A"
3. 90o Rotation
of ΔABC? C'

6. Essential Question Learning Objective
What is congruence and how do you read a congruence statement?
I will define congruence and determine if two figures are congruent.

7. 2x + 3x + 55 = 180 ∆ sum th.
5x = 125
x = 25
Acute
So,
2(25) = 50 and 3(25) = 75
x = ext.  th.
x = 120
120
60
Acute

8. 4x+8 =2x+3+51
6x-7 =103-x+2x
4x+8 =2x+54
2x=46
6x-7=103+x
3x-22 =x+80 ext.  th.
x=23
5x=110
2x=102
x=22
x=51
4(23)+8=ext. 
6(22)-7=ext. 
3(51)-22=ext. 
92+8=ext. 
153-22=ext. 
132-7=ext. 
100=ext. 
131=ext. 
125=ext. 

9. Mastery is 80% or Better on Practice problems and 5- Minute Checks.

10. Like identical twins
Another way to think about the terms corresponding is “matching”

11. 5-Minute Check

12. From p225
In triangles, there are 6 sets of corresponding parts, 3 sets of sides and 3 sets of angles.

13. The order of the letters gives away the corresponding parts

14. Pair Share
Discuss with a partner how order in naming triangles and other figures may or may not be important in determining congruent parts.
Ex: Triangle ABC and Triangle JKL.

15. You try: In your notes, copy the figures and list the
corresponding parts….Use White Boards
CA  JS, AT  SD, CT  JD
C  J, A  S, T  D

16. Exit Activity

17. Start by identifying corr. parts
(Def of  ’s)
(Def of  seg.)
substitute

18. Quick Write
In your own words briefly describe what corresponding parts are.

19. Let’s add another theorem shall we

20. 44
66

22. Exit Slip 1. 2. (Draw the diagram) .
(Hint: there are 2 pieces of information needed)

23. What was the Objective for today?

24. Essential Question Learning Objective
What is congruence and how to you read a congruence statement?
I will define congruence and determine if two figures are congruent.

25. HOME WORK
PDF Online