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DS - Interesting Question

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saikris26
 Post subject: DS - Interesting Question
 Post Posted: Thu Nov 19, 2009 11:39 pm 
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Students


Posts: 1
In Quadrilateral WXYZ, is XY perpendicular to YZ?

1. WXY is a right angle
2. WZY is a right angle

Can some one answer this question, please
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RonPurewal
 Post subject: Re: DS - Interesting Question
 Post Posted: Sat Jan 09, 2010 3:38 am 
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ManhattanGMAT Staff


Posts: 6765
saikris26 wrote:
In Quadrilateral WXYZ, is XY perpendicular to YZ?

1. WXY is a right angle
2. WZY is a right angle

Can some one answer this question, please


should be (e).

they're asking whether the angle at Y is a right angle.
even if you have the two statements together, you only know that the angles at X (from statement 1) and at Z (from statement 2) are right angles.
this isn't good enough; the angles at W and Y can be any two angles that add to 180 degrees.
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