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

Redeem

Is Quadrilateral ABCD a Rectangle? 1) Diagonals of ABCD Bis

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 1100
Joined: Sat May 10, 2014 11:34 pm
Location: New Delhi, India
Thanked: 205 times
Followed by:24 members

Is Quadrilateral ABCD a Rectangle? 1) Diagonals of ABCD Bis

by GMATinsight » Sun May 07, 2017 8:23 pm
Is Quadrilateral ABCD a Rectangle?

1) Diagonals of ABCD Bisect each other at 90 degrees
2) Diagonals of ABCD are equal in dimension

Source: www.GMATInsight.com

Answer: Option C
"GMATinsight"Bhoopendra Singh & Sushma Jha
Most Comprehensive and Affordable Video Course 2000+ CONCEPT Videos and Video Solutions
Whatsapp/Mobile: +91-9999687183 l [email protected]
Contact for One-on-One FREE ONLINE DEMO Class Call/e-mail
Most Efficient and affordable One-On-One Private tutoring fee - US$40-50 per hour
Top
Source: — Data Sufficiency |
Newbie | Next Rank: 10 Posts
Posts: 8
Joined: Sat May 06, 2017 10:45 pm

by susheelh » Tue May 23, 2017 9:21 pm
Hi,

This is how I solved. Please correct me if I am wrong.

Question stem : Is the Quadrilateral ABCD a rectangle - Yes/No?

S1: ABCD could be a Rombus or a Square. two possibilities, Insuff.
S2: ABCD could be a square or a rectangle. two possibilities, insuff
S1+S2: ABCD is a square.One possibility, sufficient.
Final answer: C
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16207
Joined: Mon Dec 08, 2008 6:26 pm
Location: Vancouver, BC
Thanked: 5254 times
Followed by:1268 members
GMAT Score:770

by Brent@GMATPrepNow » Wed May 24, 2017 4:46 am
susheelh wrote:Hi,

This is how I solved. Please correct me if I am wrong.

Question stem : Is the Quadrilateral ABCD a rectangle - Yes/No?

S1: ABCD could be a Rombus or a Square. two possibilities, Insuff.
S2: ABCD could be a square or a rectangle. two possibilities, insuff
S1+S2: ABCD is a square.One possibility, sufficient.
Final answer: C
Close, but not quite.
S2: if it were the case that quadrilateral ABCD is either a square or a rectangle, then S2 would be sufficient because a square is a type of rectangle.
However, for S2, quadrilateral ABCD could also be an isosceles trapezoid, in which case S2 is NOT sufficient.

More on quadrilaterals here: https://www.gmatprepnow.com/module/gmat ... /video/874

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Newbie | Next Rank: 10 Posts
Posts: 8
Joined: Sat May 06, 2017 10:45 pm

by susheelh » Wed May 24, 2017 7:48 am
WooW! Thanks for the correction Brent!

Though I now realise that Square and Rectangle are both essentially Rectangles - I did not have an Idea that Isosceles trapezoid has diagonals of same length! Thanks for teaching me something new today. Thanks also for the great video :).

With Regards,
Susheel
Brent@GMATPrepNow wrote:
susheelh wrote:Hi,

This is how I solved. Please correct me if I am wrong.

Question stem : Is the Quadrilateral ABCD a rectangle - Yes/No?

S1: ABCD could be a Rombus or a Square. two possibilities, Insuff.
S2: ABCD could be a square or a rectangle. two possibilities, insuff
S1+S2: ABCD is a square.One possibility, sufficient.
Final answer: C
Close, but not quite.
S2: if it were the case that quadrilateral ABCD is either a square or a rectangle, then S2 would be sufficient because a square is a type of rectangle.
However, for S2, quadrilateral ABCD could also be an isosceles trapezoid, in which case S2 is NOT sufficient.

More on quadrilaterals here: https://www.gmatprepnow.com/module/gmat ... /video/874

Cheers,
Brent
Top
Post new topic Post Reply
• Page 1 of 1