# Aptitude - Height and Distance - Discussion

Discussion Forum : Height and Distance - General Questions (Q.No. 4)
4.
An observer 1.6 m tall is 203 away from a tower. The angle of elevation from his eye to the top of the tower is 30°. The height of the tower is:
21.6 m
23.2 m
24.72 m
None of these
Explanation:

Let AB be the observer and CD be the tower.

Draw BE CD.

Then, CE = AB = 1.6 m,

BE = AC = 203 m.

 DE = tan 30° = 1 BE 3

 DE = 203 m = 20 m. 3

CD = CE + DE = (1.6 + 20) m = 21.6 m.

Discussion:
18 comments Page 1 of 2.

Vivek Sunny said:   3 years ago
No @Abirami..

For simply, remember...

SOHCAHTOA

where,
s- Sin.
o- Opposite.
h- Hypotenuse.
c- Cos.
t- Tan.

Abirami said:   4 years ago

Thus none of these is the answer.
(2)

Pooja Kale said:   5 years ago
Remember basic rule,

If Finding :
Perpendicular : Sin
Hypotenuse : cos
Base : tan
(3)

Kesavan said:   5 years ago
I'm not getting whether to use tan or cos. Please, anyone, clarify it in detail.

Dipakk said:   5 years ago
@Jatin.

Akshatha said:   6 years ago
@Rocky.

Yes, it is the right answer.

Midhun said:   6 years ago

We use tan, sin or cos depending upon what we want to get and what they have given in the question.

For example. If they give opposite side and you want to find the adjacent side. So, we will use a tan.

Rocky said:   6 years ago
The correct answer is 61.6 so none of these is the correct option.

Seeli said:   7 years ago
Why they not use cos 30?

Lakshaya said:   7 years ago
Why be is Perpendicular to cd?