Aptitude - Height and Distance - Discussion
Discussion Forum : Height and Distance - General Questions (Q.No. 3)
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:
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 2 of 5.
Anand said:
1 decade ago
Short cut of sin, cos, tan are.
sin = old/harry (opposite/hypotenuse).
cos = and/his (adjacent/hypotenuse).
tan = old/aunty (opposite/adjacent).
(note:check first letter).
sin = old/harry (opposite/hypotenuse).
cos = and/his (adjacent/hypotenuse).
tan = old/aunty (opposite/adjacent).
(note:check first letter).
Bhavy said:
7 years ago
@All.
Sin=perpendicular. Upon hypotenuse and cos, =base upon hypotenuse and tan=perpendicular upon base. And in this question, we need hypotenuse so cos is applied.
Sin=perpendicular. Upon hypotenuse and cos, =base upon hypotenuse and tan=perpendicular upon base. And in this question, we need hypotenuse so cos is applied.
Prasad Chachadi said:
7 years ago
Here, the elevation with respect to the wall but in the solution, it is taken with respect to the land!
Please correct me, if I am wrong.
Please correct me, if I am wrong.
Chiru said:
6 years ago
@All.
Here, it is mentioned that the ladder is leaning on the wall, AB is the wall and BC is the ladder that's the reason we taken Tan.
Here, it is mentioned that the ladder is leaning on the wall, AB is the wall and BC is the ladder that's the reason we taken Tan.
Lorddidah said:
4 years ago
Simply remember the code SOHCAHTOA.
SOH - Sine = Opposite/Hypotenuse.
CAH - Cos = Adjacent/Hypotenuse.
TOA - Tan = Opposite/Adjacent.
SOH - Sine = Opposite/Hypotenuse.
CAH - Cos = Adjacent/Hypotenuse.
TOA - Tan = Opposite/Adjacent.
(4)
Priya said:
7 years ago
Because of cos = adjacent/hypotenuse if we take tan it becomes AB/AC we need a length of the ladder ie BC so we take cos, ie AC/BC.
Fardeen khan said:
3 years ago
@All.
Here, actually, we want to find the (hypotenus) length of the ladder therefore we use "cos" = B/H (length's ledger).
Here, actually, we want to find the (hypotenus) length of the ladder therefore we use "cos" = B/H (length's ledger).
(2)
Anil kumar behera said:
5 years ago
We all know that tan 60=AB/AC.
then, √(3)=AB/4.6,
then,4.6*√(3)=AB,
AB = 1.732 * 4.6.
AB = 7.967.
AB = 8.
then, √(3)=AB/4.6,
then,4.6*√(3)=AB,
AB = 1.732 * 4.6.
AB = 7.967.
AB = 8.
(5)
Prasanna kumar said:
8 years ago
Why was the down angle is 60 degrees, angle of elevation means top angle should be top angle should be zero?
(1)
Jimuta said:
5 years ago
Why it will not be 7.8?
Also, we can take tan60,
AB/AC = tan60, =>AB=AC * tan60 =>AB= 4.6*tan60.
Also, we can take tan60,
AB/AC = tan60, =>AB=AC * tan60 =>AB= 4.6*tan60.
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