The angle of elevation of a cloud from a point 200 meter above a water body is 30° and the angle of depression of its reflection in the water body is 60°. The height of the cloud in meter is:

In a triangle ABC right angled at B, AB=8 unit and AC=10 unit. What is the value of $\sin^2\theta - \cos^2\theta$ where theta is angle ACB ?

A man standing on the bank of a river observes that the angle subtended by a tree standing on the opposite bank is 60 degrees on his side of bank. When he moved away 24m from the bank, he finds the angle to be 30 degrees. Find the breadth of the river:

The angle of elevation of the top of a tower from a certain point is 60°. If the observer moves 10 m away from the tower, the angle of elevation of the top of the tower decreases by 15°. The height of the tower is:

If the height of a pole is $2\sqrt{3}$ meters and the length of its shadow is 2 meters. The angle of elevation of the sun is:

The angle of elevation of the top of a building from the foot of the tower is 30° and the angle of elevation of the top of the tower from the foot of the building is 60°. If the tower is 50 m high, find the height of the building.

The angle formed by the line of sight with the horizontal level when the point is below the horizontal level is called