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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
Vote for Target Test Prep, Newsweek Readers’ Choice Awards 2026
NEWSWEEK READERS’ CHOICE 2026

BIG NEWS! Target Test Prep has been nominated, and they’d love your vote!

TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.

Vote for TTP
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Is quadrilateral ABCD

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 1578
Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members
Thanked: 82 times
GMAT Score:720
by maihuna » Fri Dec 25, 2009 9:45 am
Is quadrilateral ABCD a rectangle?

1. Both angle ABC and angle BCD are right angle.
2. Two diagonals have the same length.
Last edited by maihuna on Sat Dec 26, 2009 7:04 am, edited 1 time in total.
Charged up again to beat the beast :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Community Manager
Posts: 1537
Joined: Mon Aug 10, 2009 6:10 pmFollowed by: 252 members
Thanked: 653 times

by papgust » Fri Dec 25, 2009 7:04 pm
Statement II is not clear. Please post it correctly
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 5
Joined: Sun Nov 22, 2009 9:16 pm

by harsh.gupta.175 » Fri Dec 25, 2009 7:26 pm
Hi,

Here is how i would answer it:

Statement I:

ABC and BCD are right angles. Hence the sides AB || DC. To be a rectangle the angles BAD and CDA should also be equal to 90 degree. All we know is that the sum of these two angles =180 since AB||DC. Hence there are more than one possible combination for these angles.

Not Suficient.

Statement II:

This is the tricky one and i am not sure about this part.

Any quadilateral in which the diagonals are equal will have the same height and base for both the diagonals. This implies that the opposite sides will be parallel and hence this quadilateral will be a paralleogram. Any parallegram with diagonals equal is a rectangle.

Hence sufficient.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 189
Joined: Thu Apr 03, 2008 2:03 pm
Location: USA
Thanked: 21 times

by rohan_vus » Fri Dec 25, 2009 7:42 pm
harsh.gupta.175 wrote:Hi,

Here is how i would answer it:

Statement I:

ABC and BCD are right angles. Hence the sides AB || DC. To be a rectangle the angles BAD and CDA should also be equal to 90 degree. All we know is that the sum of these two angles =180 since AB||DC. Hence there are more than one possible combination for these angles.

Not Suficient.

Statement II:

This is the tricky one and i am not sure about this part.

Any quadilateral in which the diagonals are equal will have the same height and base for both the diagonals. This implies that the opposite sides will be parallel and hence this quadilateral will be a paralleogram. Any parallegram with diagonals equal is a rectangle.

I disagee with this statement . First of all you dont if its a parallelogram . Its not mentioned anyhwere..Consider a trapezioid ..where slant sides are equal and and horzitonal sides are unequal . Here diagonals can be equal even if its not a parallelogram .

Hence sufficient.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 124
Joined: Tue Dec 22, 2009 8:32 am
Location: Karjat
Thanked: 3 times

by linkinpark » Sat Dec 26, 2009 1:34 am
IMO A, since two opposite angles are given 90 each, rest of angles will be 90 hence its a rectangle.
from B it can be a rectanlge or a very small trapezoid that has two non parallerl sides of equal length.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Community Manager
Posts: 1537
Joined: Mon Aug 10, 2009 6:10 pmFollowed by: 252 members
Thanked: 653 times

by papgust » Sat Dec 26, 2009 2:01 am
IMO A, since two opposite angles are given 90 each, rest of angles will be 90 hence its a rectangle.
from B it can be a rectanlge or a very small trapezoid that has two non parallerl sides of equal length.
That could not be the case because I says that base angles are 90 degrees each [Angles ABC and BCD]. Still the other 2 angles need not be 90 degrees.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1578
Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members
Thanked: 82 times
GMAT Score:720

by maihuna » Sat Dec 26, 2009 7:09 am
papgust wrote:
IMO A, since two opposite angles are given 90 each, rest of angles will be 90 hence its a rectangle.
from B it can be a rectanlge or a very small trapezoid that has two non parallerl sides of equal length.
That could not be the case because I says that base angles are 90 degrees each [Angles ABC and BCD]. Still the other 2 angles need not be 90 degrees.
Can you draw two angle at right angle and other two not 90. Remember the right angles are on common side. If
Charged up again to beat the beast :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Community Manager
Posts: 1537
Joined: Mon Aug 10, 2009 6:10 pmFollowed by: 252 members
Thanked: 653 times

by papgust » Sat Dec 26, 2009 7:54 am
maihuna wrote: Can you draw two angle at right angle and other two not 90. Remember the right angles are on common side.
Attachments
untitled.JPG
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1578
Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members
Thanked: 82 times
GMAT Score:720

by maihuna » Sat Dec 26, 2009 9:05 am
papgust wrote:
maihuna wrote: Can you draw two angle at right angle and other two not 90. Remember the right angles are on common side.
good one,
Charged up again to beat the beast :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 24
Joined: Sun May 04, 2008 12:18 pm
Thanked: 1 times

by target790 » Sun Dec 27, 2009 7:39 am
OA please?

IMO -E


1>Not sufficient
2>Not sufficient
1> && 2> Not sufficient(can be rectangle or square)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1