The angle of elevation and angle of depression are always:

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Reflex

None

Acute

Obtuse

answer is A.

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Detailed Solution

We need to find the type of angle of elevation and angle of depression.
Angle of elevation and depression are the angles made by the line of sight with the horizontal line.
The angle of elevation is the angle made by the line of sight of the observer with the horizontal line when the object is placed above the horizontal line and angle of depression is the angle made by the line of sight of the observer with the horizontal line when the object is placed below the horizontal line. Since a person cannot look behind his/her back without turning to the opposite direction, the angle of angle and elevation and depression are always acute. Acute angles are those angles whose measure is less than