A person, walking 20 mts from a point towards a flag-post along a horizontal passing throught it base, observes that its angle of elevation changes from `30^@` to `45^@`. Find the height of te flag-post.

The elevation of an object on a hill is observed from a certain point in the horizontal plane through its base, to be 30^@ . After walking 120 metres towards it on level ground the elevation is found to be 60^@ . Then the height of the object (in metres ) is

From a point 30 mts from the foot of a tower, the angle of elevation of the top is 30^@ . The height of the tower is………..

The elevation of top of a hill is observed from a certain point in the horizontal plane through its base, to be 30^(@) . After walking 120 meters towards it on level ground the elevation is found to be 60^(@) . Then the height of the object (in meters) is

A person walking along a straight road towards a hill observes at two points distances sqrt3 km. The angle of elevation of the hill to be 30^@ and 60^@ . The height of the hill is

The angle of elevation of the top of a tower from a point on the same level as the foot of the tower is 15^@ . On moving 100 metres towards the tower, the angle of elevation increases to 30^@ . The height of the tower is

The angle of elevation of a tower from a point on the same level as the foot of the tower is 30^@ on advancing 150 meters towarsd the foot of the tower, the angle of elevation of the tower becomes 60^@ . Find the height of the tower.

A TV tower stands vertically on the side of a road. From a point on the other side directly opposite to the tower, the angle of elevation of the top of tower is 60^(@) . From another point 10 m away from this point, on the line joining this point to the foot of the tower, the angle of elevation of the top of the tower is 30^(@) . Find the height of the tower and the width of the road.

A flag staff of the height (a-b) stands on the top of a tower subtends the same angle at the point on the horizontal plalne through the foot of the tower which are at distant a and b from the tower. The height of the tower is