The angle of elevation of the top of a tower is $30^o$. If the height of the tower is doubled, then check, whether the angle of elevation of its top would double or not.

Given: The angle of elevation of the top of a tower is $30^o$. If the height of the tower is doubled.

To do:  To check the angle of elevation of its top.

Solution:

The given angle of elevation $=30^o$. 



Let the height of the tower$=h$, and the viewer be at a distance of $x$ from the foot of the tower.

Then,  

$\frac{h}{x}=tan30^o=\frac{1}{3}\ ........\ ( i)$

If the height of the tower is doubled then the new height $=2h$.
 
Let the angle of elevation of the top be $\theta$. 

Then, $tan\theta =\frac{2h}{x}=2\times \frac{1}{3}=\frac{2}{3}\ ........( ii)$

But if the angle of elevation doubles then it should be $=\theta =2\times 30^o=60^o$. 

Then, $tan\theta =tan60^o=3\ ........\ ( iii)$.

Comparing $( ii)$ & $( iii)$, there is a contradiction.
 

Thus, we came to know, if the height of the tower is doubled, then the angle of elevation of its top will not be doubled.


Updated on: 10-Oct-2022

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