The angle of elevation of the sun when the length of the shadow of a pole is ?3 times the height of the pole will be :

A tower subtends an angle of 30° at a point on the same level as the foot of the tower. At a second point, h m above the first, the depression of the foot of the tower is 60°. The horizontal distance of the tower from the point is :

At a point, 15 m away from the base of a 15 m high house, the angle of elevation of the top is :

When the length of the shadow of a pole is equal to the height of the pole, then the elevation of source of light is :

A 20 m high electric pole stands upright on the ground with the help of steel wire to its top and affixed on the ground. If the steel wire makes 60° with the horizontal ground, then find out the length of the steel wire.

The shadow of a tower standing on a level plane is found to be 50 m longer when the sun's altitude is 30° than when it is 60°. Find the height of the tower.

The tops of two poles of height 20 m and 14 m are connected by a wire. If the wire makes an angle 30° with the horizontal, then the length of the wire is :

The top of a 15 m high tower makes an angle of elevation of 60° with the bottom of an electric pole and an angle of elevation of 30° with the top of the pole. What is the height of the electric pole?

From a 15 m high bridge on the river, the angle of depression of a boat is 30°. If the speed of the boat be 6 Km/h, then the time taken by the boat to reach exactly below the bridge will be :

The angle of elevation of a tower from a distance 50 m from its foot is 30°. The height of the tower is :

If r sin ? = 1, r cos ? = ? 3 then the value of ( ? 3 tan ? + 1 ) is :