|
Author |
Message |
|
TAGS:
|
|
|
Manager
Joined: 02 Sep 2008
Posts: 104
Followers: 1
Kudos [?]:
7
[0], given: 1
|
Question Stats:
16% (01:40) correct
83% (02:41) wrong based on 12 sessions
Attachment: 
ps4.JPG [ 33.08 KiB | Viewed 3491 times ]
|
|
|
|
|
|
|
Manager
Joined: 02 Mar 2009
Posts: 138
Followers: 1
Kudos [?]:
24
[0], given: 0
|
Re: Geometry........ [#permalink]
 27 Apr 2009, 23:13
I think this should be it. Perfect.
|
|
|
|
|
|
Senior Manager
Joined: 08 Jan 2009
Posts: 338
Followers: 2
Kudos [?]:
42
[0], given: 5
|
Re: Geometry........ [#permalink]
27 Apr 2009, 23:33
Same method
We can write the length of the rectangle as 2x + 2y = 240
x + y 120 -----------1
given X = 45 degrees, we draw a line perpendicular to line AB and form a right triangle with X as one of the internal angles.
From that triangle we can write tan45 = 6/y-x
y - x = 6 ---------2
Sove both we get y = 63 inch
Done.
|
|
|
|
|
|
Manager
Joined: 22 Jul 2009
Posts: 200
Followers: 2
Kudos [?]:
143
[0], given: 18
|
Would anybody know if this is a GMAT question?
I had never seen before a GMAT question requiring knowledge of trigonometry.
Thanks
|
|
|
|
|
|
SVP
Joined: 16 Jul 2009
Posts: 1634
Schools: CBS
WE 1: 4 years (Consulting)
Followers: 25
Kudos [?]:
122
[0], given: 2
|
I´m with C: AB=6inches+[(20feet-2*6inches)/4]=5,25feet=5 feet 3 inches You dont need trigonometry stuff. Regards, -Noboru
_________________
The sky is the limit
800 is the limit
Find out what's new at GMAT Club - latest features and updates
|
|
|
|
|
|
Manager
Joined: 22 Jul 2009
Posts: 200
Followers: 2
Kudos [?]:
143
[0], given: 18
|
Noboru,
Could you explain how did you come up with that equation?
I understood tkarthi4u's explanation. He used the tangent formula:
tan(x)= opposite / adjacent -> tan(45) = 6 / (y-x)
Given that tan(45)=1, then y-x=6
Together with x+y=120, y=63inches=5ft3in -> answer C
I don't understand your approach.
Thanks a lot
|
|
|
|
|
|
SVP
Joined: 16 Jul 2009
Posts: 1634
Schools: CBS
WE 1: 4 years (Consulting)
Followers: 25
Kudos [?]:
122
[0], given: 2
|
powerka wrote: Noboru,
Could you explain how did you come up with that equation?
I understood tkarthi4u's explanation. He used the tangent formula:
tan(x)= opposite / adjacent -> tan(45) = 6 / (y-x)
Given that tan(45)=1, then y-x=6
Together with x+y=120, y=63inches=5ft3in -> answer C
I don't understand your approach.
Thanks a lot AB=AD+DB AD is 6 inches since x is 45 degrees. To obtain DB you have to subtract 2*6inces (6 inches because of AD and other 6inches more because CE=AD) to the long side (20 feet) and divide by 4 since there are 4 segments like DB. It´s quiet complicated to explain... hope it helped
_________________
The sky is the limit
800 is the limit
Find out what's new at GMAT Club - latest features and updates
|
|
|
|
|
|
Intern
Joined: 14 Aug 2009
Posts: 8
Followers: 0
Kudos [?]:
0
[0], given: 18
|
AB+BC=120
AB=BC+6
then
AB=63 inches
ans is C.
|
|
|
|
|
|
Senior Manager
Joined: 20 Mar 2008
Posts: 461
Followers: 1
Kudos [?]:
49
[1] , given: 5
|
1
This post received
KUDOS
qB = 10 ft. Since x = 45, angle Ast=45, since traingle Ast is a isoseles triangle. Therefore, At = st = 6 inches = .5 ft Now, qA + tB = 10 - .5 We know that qa = tB since both the pieces must be identicial and rs = At & pz = qB Therefore, qA + tB = 10 - .5 or, 2tB = 10 - .5 = 9.5 or, tB = 4.75 AB = tB + At = 4.75 + .5 = 5.25 = 5 ft 3 in. Hence, C
Attachments
ps4.JPG [ 37.06 KiB | Viewed 3141 times ]
|
|
|
|
|
|
Director
Joined: 23 Apr 2010
Posts: 593
Followers: 2
Kudos [?]:
14
[0], given: 7
|
Can I ask our math gurus to look at this one, as I don't understand the explanation quite well. Thank you.
|
|
|
|
|
|
SVP
Joined: 16 Jul 2009
Posts: 1634
Schools: CBS
WE 1: 4 years (Consulting)
Followers: 25
Kudos [?]:
122
[0], given: 2
|
nonameee wrote: Can I ask our math gurus to look at this one, as I don't understand the explanation quite well. Thank you. What exactly you dont understand? I will be glad to help you
_________________
The sky is the limit
800 is the limit
Find out what's new at GMAT Club - latest features and updates
|
|
|
|
|
|
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 3170
Location: Pune, India
Followers: 598
Kudos [?]:
2128
[4] , given: 97
|
4
This post received
KUDOS
milind1979 wrote: Attachment: The attachment ps4.JPG is no longer available The length of the rectangle is 240 inches. The diagram shows you the isosceles triangle whose side will be 6 inches. From 240, if we remove 2 of these sides of 6 inches each, we will be left with 228 inches. Attachment: 
Ques.jpg [ 8.15 KiB | Viewed 2273 times ]
This 228 inches has to be equally divided into 4 parts as shown by the blue arrows. Why are these parts equal? Because the question says that the four pieces are identical. So the smaller side of each piece has to be equal (Look at the blue line on the top. This should be equal to the blue lines at the bottom). The length of each of the blue lines will be 228/4 = 57 inches. The length of AB = 57 + 6 inches = 63 inches.
_________________
Karishma
Veritas Prep | GMAT Instructor
My Blog
Save 10% on Veritas Prep GMAT Courses And Admissions Consulting
Enroll now. Pay later. Take advantage of Veritas Prep's flexible payment plan options.
Veritas Prep Reviews
|
|
|
|
|
|
Manager
Joined: 01 Nov 2010
Posts: 184
Location: Zürich, Switzerland
Followers: 2
Kudos [?]:
11
[1] , given: 20
|
1
This post received
KUDOS
Draw a perpendicular till point P on AB to make it right isosceles triangle- With principle of 45-45-90 you get AP=6.
As Karishma told- there are 4 equal area rectangles. thus AB= AP+PB = 57+6 = 63 inches.
|
|
|
|
|
|
Director
Joined: 23 Apr 2010
Posts: 593
Followers: 2
Kudos [?]:
14
[0], given: 7
|
Karishma, thanks a lot. I got it.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
close
