The angle of elevation of a jet plane from a point A on the ground is `60^(@)`. After a flight of 15 seconds, the angle of elevation changes to `30^(@)`. If the jet plane is flying at a constant height of `1500sqrt(3)` m, find the speed ot the jet plane.

The angle of elevation of a jet plane from a point A on the ground is 60^(@) . After a flight of 15 seconds, the angle of elevation changes to 30^(@) . If the jet plane is flying at a constant height of 1500 sqrt(3) meter, find the speed of the jet plane. (sqrt(3) - 1.732)

The angle of elevation of an electric pole from a point A on the ground is 60^(@) and from a Point B towards the pole on the line joining the foot of the pole to the point A, is 75^(@) . If the distance AB = a, then the height of the pole is

An aeroplane flying horizontally 1 km above the ground is observed at an elevation of 60^(@) . After a flight of 10 seconds, its angle of elevation is observed to be 30^(@) from the same point on the ground. Find the speed of the aeroplane.

The angle of elevation of the top of a tree from a point at a distance of 200 m from its base is 60. The height of the tree is

The length of the shadow of a tower on the plane ground is sqrt(3) times the height of the tower. The angle of elevation of sun is

The angle of elevation of the top of a tower from a point of the ground which is 30 m away from the foot of a tower of heigh 10 sqrt 3 m is…………

AB is a vertical pole with B at the ground level and and A at the top .A man finds that the angle of elevation of the point A from a certain point C on the ground is 60^(@) . He moves away from the pole along the line BC to a point D such that CD = 7 m .From D . the angle of elevation of the point A is 45^(@) .Find the height of the pole .

The angle of elevation of a cloud from a point 200 m above the lake is 30^@ and the angle of depression of its. reflection in the lake is 60^@ . The height of the cloud above the lake is