Heights and Distances


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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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