1. Bellwork Determine whether the two triangles are similar
Triangle ABC: ,
Triangle DEF: ,
2) Triangle ABC: ,
3) Solve

2. Prove Triangles Similar by SSS and SAS
Lesson 6.5
Prove Triangles Similar by SSS and SAS

3. Objective
Use the SSS and SAS similarity Theorems

4. Standard
4.0 – Students prove basic theorems involving congruence and similarity.
5.0 – Students prove that triangles are congruent or similar, and they are able to use the concept of corresponding parts of congruent triangles

5. Academic Language
Ratio
Proportion
Similar Polygons

6. Write a paragraph!
What is similarity? How can you show it? What happens if you don’t know the angles of two triangles you are trying to prove?

7. Triangles with no known angles?
Use below theorem to prove similar

8. Practice

9. Practice

10. But wait, there’s more….

11. Write it down 5 triangles congruency postulates and theorems
3 triangles similarity postulates and theorems
Don’t get them confused!!! Practice with flashcards

13. It’s camping season

14. Practice

15. Homework
p.391 #1, 2, 3, 5, 7, 9, 11, 28