10.1 Angle of Elevation and Angle of Depression (Part 1)
1. Angle of elevation is the acute angle measured from a horizontal line up to the line of sight.
Example 1:
Angle of elevation of object O from P = ∠OPA
2. Angle of depression is the acute angle measured down from a horizontal line to the line of sight.
Example 2:
Angle of depression of object O from P = ∠OPA