2. Chapter 2 Similarity and Dilations
Lesson 2 Angle-angle similarity of triangles

3. Vocabulary
Indirect measurement

4. Angle-Angle Similarity of Triangles

5. Example 1 – What do you notice?

6. Try This

7. Example 2 – What do you notice. What questions do you have
Example 2 – What do you notice? What questions do you have? What do you need to know?
How tall is the flagpole?

8. Try This
How tall is the taller building?

9. Angle-Angle Similarity of Triangles
I can determine similarity.
I can use indirect measurement.

10. `
What measures must be known in order to calculate the height of tall objects using shadow reckoning?

11. Angle-Angle Similarity of Triangles
You can use Angle-Angle (AA) Similarity to test for triangle similarity. If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.
When you use indirect measurement to find unknown lengths, you must first identify the corresponding sides of the similar triangles and then correctly substitute the known lengths into a proportion.