A boy standing on a horizontal plane find that angle of elevation of a bird 100 meter away from him at `30^(@)`. A girl standing at a house 20 meter above the plane find that elevation of the bird is `45^(@)`. If boy and girl are in the opposite direction find the distance between the bird and the girl.

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.

A vertical flagstaff stands on a horizontal plane. From a point 100 m from its foot, the angle of elevation of its top is found to be 45^(@) . Find the height of the flagstaff.

A person standing at a distance of 90 m from a church observes the angle of elevation of its top to be 45^(@) . Find the height of the chruch .

A bird is sitting on the top of a 80 m high tree. From a point on the ground, the angle of elevation of the bird is 45. The bird flies away horizontally in such a way that it remained at a constant height from the ground. After 2sec the angle of elevation of the bird from the same point is 30. Find the speed of flying of the bird.

A person standing on the bank of a river observes that the angle of elevation of the top of a tree standing on the opposite bank is 60^(@) . When he moves 40 meter away from the bank, he finds the angle of elevation to be 30^(@) . Find the height of the tree and width of the river " [take", sqrt(3)=1.732]

A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is 60^(@) and where he retires 40 meters away from the tree the angle of elevation becomes 30^(@). The breadth of the river is

A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is 60^(@) and where he retires 40 meters away from the tree the angle of elevation becomes 30^(@). The breadth of the river is

From a window ( h meter above ground) the angle of elevation of other house is theta and angle of depression is phi. Find the height of the house.

A vertical tower stands on a horizontal plane, and from a point on the ground at a distance of 30 metres from the foot of the tower , the angle of elevation is 60^@ . The height of the tower is