1. and each angle

2. Chapter 9.5: Using Trigonometric Ratios in Real Life
Students will apply the use of sine, cosine, and tangent to real life situations.

3. angle of depression: angle of elevation:
the angle between the horizontal and the line of sight
angle of elevation:
The angle looking above the horizontal line to the tip of the image
Angle of depression
Angle of Elevation

4. The top of a lighthouse is 120 meters above sea level
The top of a lighthouse is 120 meters above sea level. The angle of depression from the top of lighthouse to a passing boat is 25o. How many meters from the foot of the lighthouse is the boat?
25o

5. Example 1:
You are measuring the height of a Sitka spruce tree in Alaska. You stand 45 feet from the base of the tree. You measure the angle of elevation from a point on the ground to the top of the tree to be 590.
About 75 ft

6. What is the height h of the balloon?
During the flight, a hot air balloon is observed by two persons standing at points A and B as illustrated in the diagram. The angle of elevation of point A is Point A is 1.8 miles from the balloon as measured along the ground.
What is the height h of the balloon?
Point B is 2.8 miles from point A. Find the angle of elevation of point B. h B A
0.96 mi
43.8 degrees