Heights and Distances


   
 
Heights and Distances
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.
 
 
     
   
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