The angle of depression of the point viewed is the angle formed by the line of sight with the horizontal when the point being viewed is above the horizonatal level.

When a point is observed, the angle formed by the line of sight with the horizontal level where the point being viewedis above the horizontal plane is known as____

When we lower our head to look at the object, the angle formed by the line of sight with horizontal is known as___

When the line of sight is below the horizontal level, the angle so formed by the line of sight with the horizontal is called the angle of__________

The line of sight is the straight line drawn from the eye of an observer to the point where the object is viewed by the observer.

Form a point on the same plane along the horizontal line passes through the foot of a chimney, the angle of elevation of the top of the chimney is 30^(@) and the angle of elevation of the top of the chimney is 60^(@) at a point on the same straight line proceeding 50 metres nearer to the chimney. Calculate the height of the chimney.

An observer on the top of a monument 500 m above the sea level, observes the angles of depression of the two boats to be 45^@ and 30^@ respectively. Find the distance between the boats if the boats are- On the opposite sides of the monument,

Find the circular value of an angle formed by the end point of hour of a clock in 1 hour rotation.

A man observes that when he moves up a distance c metres on a slope, the angle of depression of a point on the horizontal plane from the base of the slope is 30^0, and when he moves up further a distance c metres, the angle of depression of that point is 45^0dot The angle of inclination of the slope with the horizontal is.