In Fig. 12.58, what are the angles of depression from the observing positions `O_1` and `O_2` of the object at `A` ? (FIGURE)

If the angle of depression of an object from a 75 m high tower is 30^@ , then the distance of the object from the tower is

In fig what is the angle of elevation of point A from C and angle of depression of point D from A?

From a point on a bridge across a river the angles of depression of the banks on opposite side of the river are 30o and 45o respectively. If bridge is at the height of 30m from the banks,find the width of the river.

A man on the deck of a ship is 10m above the water level.He observes that the angle of elevation of the top of a cliff is 45o and the angle of depression of the base is 30o . Calculate the distance of the cliff from the ship and the height of the cliff.

In Fig, O is the center of the circle. Find the angle of triangleABC .

From the top of a building of height h meter, the angle of depression of an object on the ground is theta . What is the distance (in meter) of the object from the foot of the building ?

From the top of a building of height h m, the angle of depression of an object on the ground is theta. What is the distance (in m) of the object from the foot of the building?

From the top of a building of heighth metresthe angle of depression of an object on theground is 'a'.The distance (in metres) of theobject from the foot of the building is -

As observed from the top of a 150m tall light house,the angles of depression of two ships approaching it are 30o and 45o .If one ship is directly behind the other,find the distance between the two ships.