1. Trigonometry in Real Life
November 13, 2014
1. How do we use a clinometer to measure angle of elevation and depression?
2. How do we use angle of elevation and depression to solve real-life problems?

2. Finding angle of elevation using a clinometer

3. Finding angle of depression using a clinometer

4. Mission #1: Find the height of the Science banner hanging outside B508
Angle of elevation
Height of your eye level

5. Mission #2: Find the height between the B4 floor and B5 floor.
Given: 6.5 meters
Height of your eye level
B4 Locker
Angle of depression
B5 floor
B4 floor

6. Real-life Problem 1
While boating on Lake Trig, a limnologist (a scientist that studies freshwater lakes) drops an object straight down into the lake from her boat. The scientist then moves the boat 34 m and sees the object at the bottom of the lake. She measures an angle of 60° between the surface of the water and the object. Draw a well-labeled diagram representing this problem. Determine how deep the lake is.

7. Real-life Problem 2
The towers of a suspension bridge reach about 140 m above the level of the bridge. The angles of elevation of the towers seen from the center the bridge and either end are 10° and 19° respectively. How long is the bridge?