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geometry- GMAT Prep solution

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geometry- GMAT Prep solution [#permalink] New post 03 Sep 2009, 12:33
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help please
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Re: geometry- GMAT Prep solution [#permalink] New post 04 Sep 2009, 03:19
IMO .......
[Reveal] Spoiler:
..A ...
..........it is

we dont need to know the actual size of angle here

both the triangles (ABD and BDC) are isosceles
with angle (x ,x,180-2x) and( 2x,2x,180-4x) respectively


ISBtarget wrote:
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help please

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Re: geometry- GMAT Prep solution [#permalink] New post 04 Sep 2009, 03:55
hi abd angle adb is 180-2x and angle a is x therefore angle abd will be x.. hence abd is isosceles with ad=bd..
now bdc is also isosceles with bd = bc
ans a is sufficient
Re: geometry- GMAT Prep solution   [#permalink] 04 Sep 2009, 03:55
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