One sees a boat in the sea, on the top of a light house at a depression of `20^circ`. After sometimes he sees the boat at a depression of `30^circ`. If the height of the lighthouse is 160 meter. What distance will the boat travel during this time?
[tan 20=0.3640 , tan 30=0.5774]

On the top of a 60 metre high building sees the top and bottom of a tower at a depression of 30^circ and 60^circ . What is the height of the tower?

One sees the top of a tree on the bank of a river at an elevation of 70^circ from the other bank. Stepping 20 metres back, he sees the top. of the tree at an elevation of 55^circ . Height of the person is '1.4' metres. a) Draw a rough figure and mark the measurements. b) Find the height of the tree. c) Find the width of the river. '[tan 70=2.75 , tan 55=1.43]'

A boy sees the top of a tówer with an angle of elevation. 60^circ . Stepping 20metres back, he sees the same top with an angle of elevation 30^circ . Draw a rough figure and calculate the height of the tower.

A boy standing on the top of a tower 20 metrés height, saw the top of a building at an elevation of 50^circ and its base at a depression of 30^circ a) Draw a rough figure. according to the given data. b) find the distance between the tower and the building. c) find the distance from the top of the tower to the base of the building. d) find the height of the building. [sin 50^circ =0.77, cos 50^circ =0.64, tan 50^circ =1.2, 'sqrt3 =1.7]

A man standing on the top of a light house sees a ship approaching the seashore at an angle of depression of 22^circ . After the ship has travelled 100 meters more towards the sea shore, he sees it at an angle of depression of 31^circ .The ship stopes there. a) Draw a rough-sketch. b) How far is the ship from the light house. c) Find the height of the light house. (tan 22^circ =0.4, tan 31^circ =0.6)

Two buildings in a plane ground are 20 metres apart. From the top of the smaller building, one sees the base of the building at a depression of 50^circ and its top at an elevation of 25^circ . a) Draw a rough figure and mark the measurements. b) Find the helght of the smaller building. c) Find the height of the bigger building. '[tan 50^circ=1.2, tan 25^circ=0.4]'

A child stands 30 metres away from the foot of a telephone tower, sees the top of the tower at an angle of elevation 30^circ . Stepping some distance towards the tower, sees it at an elevation of 45^circ a) What is the height of the tower? b) How much distance did he walk?

A tower is built in a river of width 80 metres. One sees the top of the river at an elevation of 55^circ and 65^circ . from either banks of the river. a) Draw a figure using the given measurements. b) Find the height of tower c) Find the distances to either banks from the foot of the tower. [tan 55^circ =1.43 , tan 65^circ =2.14]

A girl standing on a lighthouse built on a cliff near the seashore, observes two boats due East of the lighthouse. The angles of depression of the two boats are 30^@ and 60^@ . The distance between the boats is 300 m:-Find the distance of the top of the lighthouse from the sea level.(Boats and foot of the lighthouse are in a straight line).

From the top of a building 15 meter high, one sees the top of another taller building at an angle of elevation of 70^circ and bottom at an angle of depression of 40^circ a) Draw a rough figure and mark the measurements given. b) Find the height of the taller building. [ tan 70 = 2.747,tan40 = 0.839 ]