1. Indirect Measurement

2. Using Similar Triangles allows us to measure distances that are impossible to measure directly with a ruler, yard stick, or tape measure. Think about Problems 41-44 in section 8.2

3. Scan picture from 8.2 page 428

4. Shadow Method

5. TreeMan Height Shadow Height Shadow =

6. Mirror Method Level ground

7. Mirror Method Level ground Height Distance Height Distance = Object Man

8. Camera

9. Height Distance Height Distance = Film Man

10. Hypsometer 10 cm 10 9 8 7 6 5 4 3 2 1 Units marked off in Centimeters Vertical Scale Horizontal Scale

11. Hypsometer

12. Horizontal Vertical x. Distance = HYPS Object Distance x Eye Level Final Answer = x + Eye level

13. Make a Hypsometer Precision is the Key Materials Needed: Cardboard Straw Thin String / Strong Thread / Fishing line Weight (Hex-nut, Fishing weight, Washer) Ruler (to mark Vertical and Horizontal Scale) Tape