English

The Distance of the Gate of a Temple from Its Base is √ 3 Times It Height. Find the Angle of Elevation of the Top of the Temple. - Mathematics

Advertisements
Advertisements

Question

The distance of the gate of a temple from its base is `sqrt(3)` times it height. Find the angle of elevation of the top of the temple.

Sum

Solution

Let AB be the temple and C be the position of its gate. 
Let h be the height of the temple. Then, 
AB= h 
BC = Distance of the gate of temple from its base = `sqrt(3)`h 
In ΔABC, 

tanθ = `"AB"/"BC"`

⇒ `tanθ = h/(sqrt(3)h) = 1/sqrt(3)`

But , `tan30^circ = 1/sqrt(3)`

∴ θ = `30^circ`

Thus , the angle of elevation of the top of the temple is `30^circ`.

shaalaa.com
Heights and Distances - Solving 2-D Problems Involving Angles of Elevation and Depression Using Trigonometric Tables
  Is there an error in this question or solution?
Chapter 22: Heights and Distances - Exercise

APPEARS IN

Frank Mathematics - Part 2 [English] Class 10 ICSE
Chapter 22 Heights and Distances
Exercise | Q 1

RELATED QUESTIONS

Prove the following identities:

sin4A – cos4A = 2sin2A – 1


Two persons are standing on the opposite sides of a tower. They observe the angles of elevation of the top of the tower to be 30° and 38° respectively. Find the distance between them, if the height of the tower is 50 m.


A kite is attached to a string. Find the length of the string, when the height of the kite is 60 m and the string makes an angle 30° with the ground.


A man stands 9 m away from a flag-pole. He observes that angle of elevation of the top of the pole is 28° and the angle of depression of the bottom of the pole is 13°. Calculate the height of the pole.


The angles of elevation of the top of a tower from two points on the ground at distances a and b metres from the base of the tower and in the same straight line with it are complementary. Prove that the height of the tower is `sqrt(ab)` metre.


A vertical pole and a vertical tower are on the same level ground in such a way that from the top of the pole, the angle of elevation of the top of the tower is 60° and the angle of depression of the bottom of the tower is 30°. Find:

  1. the height of the tower, if the height of the pole is 20 m;
  2. the height of the pole, if the height of the tower is 75 m.

A man observes the angle of elevation of the top of the tower to be 45°. He walks towards it in a horizontal line through its base. On covering 20 m the angle of elevation changes to 60°. Find the height of the tower correct to 2 significant figures. 


The angle of elevation of a tower from a point 200 m from its base is θ, when `tan θ = 2/5`. The angle of elevation of this tower from a point 120m from its base is `Φ`. Calculate the height of tower and the value of `Φ`. 


The angle of depression of a boat moving towards a diff is 30°. Three minutes later the angle of depression of the boat is 60°. Assuming that the boat is sailing at a uniform speed, determine the time it will take to reach the shore. Also, find the speed of the boat in m/second if the cliff is 450m high. 


A vertical tower stands on a horizontal plane and is surmounted by a flagstaff of height 7 meters. At a point in a plane, the angle of elevation of the bottom and the top of the flagstaff are respectively 30° and 60°. Find the height of the tower.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×