A 1.5m tall boy is standing at some distance from a 30m tall building. The angle of elevation from his eyes to the top of the building increases from `30o` to `60o` as he walks towards the building. Find the distance he walked towards the building.

9.A boy 1.7m tall is standing on a horizontal ground, 50m away from a building. The angle of elevation of the top of the building from his eye is 60^(@) .Calculate the height of the building.(Take sqrt(3)=1.73 ).

A man 2.5 m tall is 32.5 m away from a building. The angle of elevation of the top of the building from his eyes is 60^@ . What is the height of the building? Also, calculate the distance between the eye of man and top point of the building.

A man is standing at a distance of 500 m from a building. He notes that angle of elevation of the top of the building is 3.6^(@) . Find the height of the building. Neglect the height of the man and take pi = 3.14

In fig height of a building is h+2 and point C is h m from the foot of the building. Find the angle of elevation of the top of the building from a point 2 m from point C.

A boy standing on a horizontal plane finds a bird flying at a distance of 100 m from him at an elevation of 30^@. A girl standing on the roof of 20 metre high building, finds the angle of elevation of the same bird to be 45^@. Both the boy and the girl are on opposite sides of the bird. Find the distance of bird from the girl.

An observer,1.5m tall,is 28.5m away from a tower 30m high.Determine the angle of elevation of the top of the tower from his eye.