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

A boy is standing on the ground and flying a kite with 100m of string at an elevation of 30o . Another boy is standing on the roof of a 10 m high building and is flying his kite at an elevation of 45o . Both the boys are on opposite sides of both the kites. Find the length of the string that the second boy must have so that the two kites meet.

From the top of a 7 m high building, the angle of elevation of the top of a tower is 60° and the angle of depression of the foot of the tower is 30°. Find the height of the tower.

A man standing in front of a plane mirror finds his image to be at a distance of 6 metre from himself. The distance of man from the mirror is :

From the top of a 75m high lighthouse from the sea level the angles of depression of two ships are 30^@ and 45^@ . If the two ships are on the opposite sides of the light house then find the distance between the two ships.

A man standing in front of a plane mirror finds his image at a distance 6 metre from himself. What is the distance of man from the mirror?

A man standing in front of a plane mirror finds his image at a distance 6 metre from himself. What is the distance of man from the mirror?

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 30^@ to 60^@ as he walks towards the building. Find the distance he walked towards the building.

The angle of elevation of the of a tower at a distance of 120 m from its foot on a horizontal plane is found to be 30^(@) . Find the height of the tower.

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 60 m high, find the height of the building.