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Aptitude - Height and Distance - Discussion

Discussion Forum : Height and Distance - General Questions (Q.No. 3)
Height and Distance
3.
The angle of elevation of a ladder leaning against a wall is 60° and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:
2.3 m
4.6 m
7.8 m
9.2 m
Answer: Option
Explanation:

Let AB be the wall and BC be the ladder.

Then, ACB = 60° and AC = 4.6 m.

AC = cos 60° = 1
BC 2

BC = 2 x AC
= (2 x 4.6) m
= 9.2 m.

Discussion:
45 comments Page 3 of 5.
Lucifer123 said:   10 years ago
@Cynthia.

No wonder girls are dumb.

We want "BC" (the length of the ladder) not "AC" (height of the wall).
Jayanth said:   5 years ago
Here, they asked about the length of the ladder, not about the hypotenuse.

So the correct answer is 7.8m.
(1)
Yeshi Samdup said:   4 years ago
Cos = adj/hyp
Cos60= 4.6m/hyp
0.5= 4.6m/hyp
Hyp= 4.6m/.
Therefore Hyp or length of ladder is 9.2m.
(4)
Shyam said:   1 decade ago
Why the above two problem we taking "tan", but for this problem we took "cos". Anyone explain ?
Puneet kulkarni said:   7 years ago
We have formula:

Tan=perpendicular/base
Sine=perpendicular/hypothesis
Cos=base/hypothesis.
Manjunath said:   10 years ago
They are asking 4.6 m away from the wall. But here its get attach with the wall. How come?
Eben Thomas said:   3 years ago
sin=o/h , cos=a/h, tan=o/a,

Here,
o- Opposite side;
h-Hypotnuse;
a- Adjasent side.
(1)
Student said:   8 months ago
How to identify when we use tan, cot or sin function? Anyone please clarify.
(1)
Cynthia said:   1 decade ago
Why can't we take in this way:

Tan 60 = AB/4.6.

1.73 = AB/4.6.
AB = 7.958.
SREEJA said:   9 years ago
How can we remember here we should use "Tan" and there we should use "Cos"?
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