BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Is quadrilateral ABCD Square?

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
User avatar
GMAT Instructor
Posts: 1248
Joined: Thu Mar 29, 2012 2:57 pm
Location: Everywhere
Thanked: 503 times
Followed by:192 members
GMAT Score:780

by Bill@VeritasPrep » Fri May 04, 2012 9:25 am
To be a square, ABCD must have 4 right angles and 4 equal sides.

1. B and C are right angles, so it could be a square, but it could also be a rectangle. Insufficient.

2. ABCD has 3 equal sides, so it could be a square, it could also be a rhombus. Insufficient.

Combined, the only quadrilateral that meets both conditions is a square. Sufficient.
Join Veritas Prep's 2010 Instructor of the Year, Matt Douglas for GMATT Mondays

Visit the Veritas Prep Blog

Try the FREE Veritas Prep Practice Test
Top
Senior | Next Rank: 100 Posts
Posts: 37
Joined: Fri Jun 25, 2010 11:07 am
Thanked: 1 times

by bellcurve » Sun May 06, 2012 12:38 pm
Image

Why don't we have to conside self intersecting quadrilateral in this case (like the forth one in the pic)? If we draw a self intersecting quadrilateral, then we can have one that satisfies stmts I and II and still not a square.
Top
User avatar
GMAT Instructor
Posts: 1248
Joined: Thu Mar 29, 2012 2:57 pm
Location: Everywhere
Thanked: 503 times
Followed by:192 members
GMAT Score:780

by Bill@VeritasPrep » Sun May 06, 2012 2:20 pm
I have never seen a GMAT question involving complex (self-intersecting) polygons, and in any event I don't you could draw one where we had three equal sides and two right angles formed by those three equal sides.
Join Veritas Prep's 2010 Instructor of the Year, Matt Douglas for GMATT Mondays

Visit the Veritas Prep Blog

Try the FREE Veritas Prep Practice Test
Top
Senior | Next Rank: 100 Posts
Posts: 37
Joined: Fri Jun 25, 2010 11:07 am
Thanked: 1 times

by bellcurve » Sun May 06, 2012 5:36 pm
Image

This is what I am talking about.

Isn't this picture satifies all the conditions?
Top
User avatar
GMAT Instructor
Posts: 1248
Joined: Thu Mar 29, 2012 2:57 pm
Location: Everywhere
Thanked: 503 times
Followed by:192 members
GMAT Score:780

by Bill@VeritasPrep » Sun May 06, 2012 5:44 pm
It does, but again, I do not believe complex polygons are tested. What is the OA?
Join Veritas Prep's 2010 Instructor of the Year, Matt Douglas for GMATT Mondays

Visit the Veritas Prep Blog

Try the FREE Veritas Prep Practice Test
Top
Senior | Next Rank: 100 Posts
Posts: 37
Joined: Fri Jun 25, 2010 11:07 am
Thanked: 1 times

by bellcurve » Mon May 07, 2012 5:30 am
The OA is C and that is why I got confused. Unless you make the assumption that complex quadrilaterals are excluded from the picture, you have to go with E.
Top
User avatar
Legendary Member
Posts: 934
Joined: Tue Nov 09, 2010 5:16 am
Location: AAMCHI MUMBAI LOCAL
Thanked: 63 times
Followed by:14 members

by [email protected] » Fri May 25, 2012 9:15 pm
The OA has to be a C. In the concepts, under the chapter Quadrilaterals, such complex quadrilaterals are not in the portion. I know that the GMAT is famous for breaking its own rules and asking questions out of syllabus, but it will not go so out of the box.
IT IS TIME TO BEAT THE GMAT

LEARNING, APPLICATION AND TIMING IS THE FACT OF GMAT AND LIFE AS WELL... KEEP PLAYING!!!

Whenever you feel that my post really helped you to learn something new, please press on the 'THANK' button.
Top
Post new topic Post Reply
• Page 1 of 1