1. Agenda Investigation 8-3 Proving Triangles are Similar Class Work
Homework

2. Warm Up 1. State if the following figures are similar
If so, Write the similarity statement.
2. The two triangles are similar. Solve for x.

3. Homework Check

4. Investigation: Triangles with Two Pairs of Congruent Angles
With a partner, complete the Investigation Worksheet.
Answer both questions

5. 8-3 Proving Triangles are Similar
3 ways to prove Triangles are Similar:
AA ~
If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar
Similarity Statement:

6. 2. SAS ~
If 2 sides of a triangle are proportional to two sides of another triangle AND the included (in between) angles are congruent, then the triangles are similar. Similarity Statement:

7. 3. SSS ~
If all 3 corresponding sides of two triangles are proportional, then the triangles are similar Similarity Statement:

8. Indirect Measurement using similar triangles often uses one of these two facts:
Light reflects off a mirror at the same angles at which it hits the mirror.
Similar By:

9. 2. Similar Triangles are formed by figures and their shadows Similar By:

10. Examples:
For each of the following, explain why the triangles are similar and write a similarity statement

18. Class Work
8-3 Practice in Book
Problems 1-9

19. Homework
Complete the worksheet