Definitions
(i) Angle of elevation, and(ii) Angle of depression.
Angle of elevation
Let O be the observer and P be the point under observation. Therefore, OP is the 'line of sight'. OQ is a line parallel to the horizontal plane.
is called the angle of elevation.
The point P, under observation, is at a higher level than the observer's position.
Angle of depression
Let O be the observer and P be the point under observation. Therefore, OP is the 'line of sight'. OQ is a line parallel to the horizontal plane.
is called the angle of depression.
The point P, under observation, is at a lower level than the observer's position.
