The angle formed by the line of sight with the horizontal when the object viewed is below the horizontal level is:

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angle of depression

Heights and Distances of these

angle of elevation

corresponding angle

answer is C.

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Detailed Solution

We need to find the ngle formed by the line of sight with the horizontal when the object viewed is below the horizontal level.
When the angle viewed by the observer is below the horizontal line, the angle made by the line of sight of the observer with the horizontal line is the angle of depression.
When the angle viewed by the observer is below the horizontal line, the angle made by the line of sight of the observer with the horizontal line is the angle of depression.
Corresponding angles are those which are present at the same corner when a line cuts two lines. The corresponding angles are equal to each other.
Angle of elevation is the angle made by the line of sight of the observer with the horizontal line when the object is above the horizontal line.
When the angle viewed by the observer is below the horizontal line, the angle made by the line of sight of the observer with the horizontal line is the angle of depression.
Therefore, option 3 is correct.

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