
The shadow of a tower standing on a level ground is found to be 60 metres longer
when the sun's altitude is than when it is . Find the height of the tower.
Answer
539.1k+ views
Hint:- Draw figure and then use trigonometry identity .
The above figure is drawn with respect to given conditions in question.
Let the height of the tower be AB metres.
As we are given that the difference in length of shadows DC (see in figure) is 60 metres.
As, we can see from the above figure that the length of shadow when altitude
of sun is be metres .
So, length of the shadow when altitude of sun is be metres
As we know that, .
So, as we can see from the above figure in that, .
So, (1)
And in , .
Now, putting the value of and from equation 1 to the above equation. We get,
metres
Now, as we have defined above that height of the tower is y metres.
Hence, the height of the tower will be 82 metres.
Note: - Whenever we come up with these types of problems then first, we should draw the figure according to the given conditions in question then, we will use the trigonometric functions to get the height of the tower, which will be the easiest and efficient method.

The above figure is drawn with respect to given conditions in question.
Let the height of the tower be AB
As we are given that the difference in length of shadows DC (see in figure) is 60 metres.
As, we can see from the above figure that the length of shadow when altitude
of sun is
So, length of the shadow when altitude of sun is
As we know that,
So, as we can see from the above figure in
So,
And in
Now, putting the value of
Now, as we have defined above that height of the tower is y metres.
Hence, the height of the tower will be 82 metres.
Note: - Whenever we come up with these types of problems then first, we should draw the figure according to the given conditions in question then, we will use the trigonometric functions to get the height of the tower, which will be the easiest and efficient method.
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