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GMAT PREP DS 4

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Source: — Data Sufficiency |
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by vishubn » Fri Dec 26, 2008 7:59 am
A)

Adb=z
ABD=y

ADB=2x+y=180

x+y+z=180

x+180-2x+z=180

-x+z=0

x=z--(1)

isosceles triangle !! side opp to Z AD=6 similary BD=6

and now 2x and 2x are equal there BC=6

A) angle doesnt help in any ways

its neother 45:45:90 / 30:60:90

IMO A
Last edited by vishubn on Fri Dec 26, 2008 6:24 pm, edited 1 time in total.
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Re: GMAT PREP DS 4

by ronniecoleman » Fri Dec 26, 2008 8:01 am
sparsh.21 wrote:Image


Please explain...

thanks
it seems i have gone blind :shock: :shock:
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by vittalgmat » Fri Dec 26, 2008 12:05 pm
here is another way to solve this:
It uses the rule:
The exterior angle of a triangle = sum of the other 2 interior angles.

So from the figure

BDC = ABD + BAD

So ABD = x. There for Triangle ABD is isoscles.

Stmt 1 says AD = 6
So AD = BD = 6

Triangle BDC is isoscles coz base angles 2x and 2x.
So BC = BD = 6.
Sufficient.

Stmt 2. : we cannot find length of any side from just the angles alone.


So A
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by vittalgmat » Fri Dec 26, 2008 12:07 pm
vishubn wrote:A)



IMO B
Vishu,
I guess u meant A right ?? ;-)
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by vishubn » Fri Dec 26, 2008 6:25 pm
vittalgmat wrote:
vishubn wrote:A)



IMO B
Vishu,
I guess u meant A right ?? ;-)
OOPSIEE!! i always do this !! even sometimes in test :(

thanks vittal

vishu
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