1. Angles of Elevation and Depression
Geometry Unit 10 - Angles of Depression and Elevation
Tuesday, March 15
Angles of Elevation and Depression
Solve problems involving angles of elevation and angles of depression.
Unit 10

2. Angles of Elevation and Depression
An angle of elevation is the angle formed by a horizontal line and a line of sight to a point above the line.
An angle of depression is the angle formed by a horizontal line and a line of sight to a point below the line.
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3. Angles of Elevation and Depression
Geometry Unit 10 - Angles of Depression and Elevation
Tuesday, March 15
Angles of Elevation and Depression
Angle of depression
Insert example 1 here.
Angle of elevation
Unit J
Unit 10

4. Example: Angle of Elevation
Geometry Unit 10 - Angles of Depression and Elevation
Tuesday, March 15
Example: Angle of Elevation
If we know the height of the lighthouse above sea level and the angle of elevation, we can find the distance from the boat to the shore.
200 ft.
15° x
In this case, the top of the light-house is 200 feet above sea level, and the angle of elevation is 15°.
Insert examples 2 – 4 here.
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Unit 10

5. Key Concepts – Get Organized
Angle of Elevation
Words
An angle formed by a horizontal line and a line of sight to a point above.
Diagram
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6. Key Concepts – Get Organized
Angle of Depression
Words
An angle formed by a horizontal line and a line of sight to a point below.
Diagram
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7. Lesson Quiz – Part I Using the diagram, name each angle type: ∠1 ∠2∠3 ∠4
angle of elevation
angle of depression
angle of depression
angle of elevation
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8. Lesson Quiz – Part II
A person snorkeling sees a turtle on the ocean floor at an angle of depression of 38º. She is 14 feet above the ocean floor. How far from the turtle is she? Round to the nearest foot.
This angle is also 38°. We will use the sin 38°, since we have the opposite leg and need to find the hypotenuse. →
38°
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