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albertrahul
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jawanindia2007
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 Posted: Mon Jul 14, 2008 11:43 pm Post subject: |
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| Is the answer to this question B?
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BlueRain
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| Posted: Mon Jul 14, 2008 11:49 pm Post subject: |
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I believe the OA should be A.
I'll explain if it is the right answer 
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jawanindia2007
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| Posted: Mon Jul 14, 2008 11:51 pm Post subject: |
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| sorry typo......... ithink it is c.let me know if i am right
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ksh
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| Posted: Tue Jul 15, 2008 12:09 am Post subject: |
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| jawanindia2007 wrote: | | sorry typo......... ithink it is c.let me know if i am right |
here the answer is A.
given the length of one side it can be deduced through the isosceles triangle, the length of required side.
hence A
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ksh
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| Posted: Tue Jul 15, 2008 12:16 am Post subject: |
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| ksh wrote: | | jawanindia2007 wrote: | | sorry typo......... ithink it is c.let me know if i am right |
Statemet 1. AD=6
angle ADB=180-2x
So, angleB=x
which means triangle ADB is an isosceles. also, from this AD=BD.
After knowing the length of BD, BC is known as the triangle BDC is also an isosceles.
Hence 1 is sufficient.
stmt2. merely knowing the angle cant let one know side of a triangle. Hence, insufficient
hence A |
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manju_ej
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| Posted: Thu Jul 17, 2008 2:45 am Post subject: Re: GMAT Prep - Geometry |
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Angle BDC (2x)= angle DAB(X)+ angle DBA(X)
ie 2X= sum of the non-adjacent angles(X+X)
So it can be concluded, AD =BD = BC.(Isoceles triangles)
Statement (1) AD=6, sufficient , so BC = 6
Statemet (2) X=36, this info just reiterates the fact AD= BD=BC, but without the length of any one of these sides, length of BC cant be found, so Insufficient.
Answer - A
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