Angle of elevation and depression  Bearings
Angle of elevation and depression
Basic concepts:
 Use sine ratio to calculate angles and sides (Sin = $\frac{o}{h}$ )
 Use cosine ratio to calculate angles and sides (Cos = $\frac{a}{h}$ )
 Use tangent ratio to calculate angles and sides (Tan = $\frac{o}{a}$ )
Related concepts:
 Law of sines
 Law of cosines
Lessons
Notes:
When you look at an object above you, the angle between the horizontal and your line of sight to the object is called the angle of elevation.
When you look at an object below you, the angle between the horizontal and your line of sight to the object is called the angle of depression.

Intro Lesson
Introduction to application to bearings – angle of elevation/depression