Q4 of 28 Page 93

From the top of a 100 m high tower the angle of depression of a point on the earth is 30°. The distance of the point from the base of the tower is


Let BC is Height of the Tower. Height of the Tower is 100m. Angle of Depression is 30o from point C. The Length of the Base is BC = b.


We know that ∠BAC = 30o (interior angles )



We know that,



More from this chapter

All 28 →
2

From a distance of 100 m from the foot point of a tower the angle of elevation of its top is 60°. Then height of the tower is

 3

A ladder 15 m long reaches the top of a vertical wall. If this ladder makes an angle of 60° with the wall, then height of the wall is

 5

A bridge over a river makes an angle of 45° with the bank of the river. If the length of the bridge over the river is 150 m then the width of the river will be

 6

The tops of two pillars whose heights are 20 m and 14 m are joined by a wire. If the wire makes an angle of 30° with the horizontal line, then the length of the wire is