1. I4 Angles of Elevation and Depression

2. Drill: Mon, 5/2 Solve. Round to the nearest hundredth. Identify the pairs of alternate interior angles. OBJ: SWBAT solve problems involving angles of elevation and depression.

3. Can you label the angles correctly?

4. Example 1: Classify each as an angle of elevation or angle of depression.

5. An angle of elevation is the angle formed by a horizontal line and a line of sight to a point above the line. In the diagram,  1 is the angle of elevation from the tower T to the plane P. An angle of depression is the angle formed by a horizontal line and a line of sight to a point below the line.  2 is the angle of depression from the plane to the tower.

6. Since horizontal lines are parallel,  1   2 by the Alternate Interior Angles Theorem. Therefore the angle of elevation from one point is congruent to the angle of depression from the other point.

7. Example 2

8. Solution

9. Example 3 On your own

10. Example 4

11. Solution

12. Example 5 On your own

13. Bookwork Practice Page 547 #10 – 20 #28 – 30

14. Exit Ticket

15. Challenge