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The figure above shows the dimensions of a rectangular board

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The figure above shows the dimensions of a rectangular board [#permalink]

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The figure above shows the dimensions of a rectangular board that is to be cut into four identical pieces by making cuts at points A, B, and C, as indicated. If x = 45, what is the length AB ? (1 foot = 12 inches)
[Reveal] Spoiler: OA

Last edited by Bunuel on 09 Jan 2014, 02:04, edited 1 time in total.
Renamed the topic, edited the question and added the OA.

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Re: Geometry........ [#permalink]

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New post 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.

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Re: Geometry [#permalink]

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New post 19 Aug 2009, 15:56
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Would anybody know if this is a GMAT question?

I had never seen before a GMAT question requiring knowledge of trigonometry.

Thanks

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Re: Geometry [#permalink]

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New post 19 Aug 2009, 16:09
I´m with C:

AB=6inches+[(20feet-2*6inches)/4]=5,25feet=5 feet 3 inches

You dont need trigonometry stuff.

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Re: Geometry [#permalink]

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New post 19 Aug 2009, 16:21
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

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Re: Geometry [#permalink]

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New post 20 Aug 2009, 14:05
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
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Re: Geometry [#permalink]

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New post 21 Aug 2009, 19:35
AB+BC=120
AB=BC+6

then
AB=63 inches

ans is C.

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Re: Geometry [#permalink]

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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
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Re: Geometry [#permalink]

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New post 25 Oct 2010, 04:59
Can I ask our math gurus to look at this one, as I don't understand the explanation quite well. Thank you.

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Re: Geometry [#permalink]

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New post 09 Nov 2010, 11:12
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
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Re: Geometry [#permalink]

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milind1979 wrote:
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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
Ques.jpg [ 8.15 KiB | Viewed 8540 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.
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Re: Geometry [#permalink]

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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.

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Re: Geometry [#permalink]

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New post 11 Nov 2010, 02:47
Karishma, thanks a lot. I got it.

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Re: The figure above shows the dimensions of a rectangular board [#permalink]

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New post 24 Mar 2016, 09:47
VeritasPrepKarishma wrote:
milind1979 wrote:
Attachment:
ps4.JPG


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


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.


Simply loved your explanation, short and crisp. No unnecessary formulae, simple common sense. I envy you, for the thought didn't strike me. I solved it but in a lengthy way. Thank you. It's a moment of qualia for me.
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Re: The figure above shows the dimensions of a rectangular board   [#permalink] 17 Jun 2017, 06:22
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