Last visit was: 03 May 2026, 10:27 It is currently 03 May 2026, 10:27
Home
Messages
Tests
Schools
Events
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
linker
User avatar
Joined: 25 Sep 2004
Last visit: 02 Dec 2004
Posts: 16
Own Kudos:
1,384
Posts: 16
Kudos: 1,384
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 18 Nov 2004, 18:05
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

History

Date
Time
Result
Not Attempted Yet
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a parallelogram?
1) the triangle ABC and the triangle ADC area is equal.
2) AB= AC



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Guest
Joined: 31 Dec 1969
Last visit: -
Products:
GMAT Club Tests
Kudos: 0
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 18 Nov 2004, 18:37
Kudos
Add Kudos
Bookmarks
Bookmark this Post
B?
1. Can be a rectangle, square..rhombus.Insuff
2. AB=AC. i.e, AB not equal DC (opp side of AC) or cant be parallel. Suff. ABCD not a parallelogram.
User avatar
ian7777
User avatar
Joined: 09 Mar 2003
Last visit: 24 Jan 2010
Posts: 227
Own Kudos:
178
Posts: 227
Kudos: 178
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 18 Nov 2004, 21:11
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Anonymous
B?
1. Can be a rectangle, square..rhombus.Insuff
2. AB=AC. i.e, AB not equal DC (opp side of AC) or cant be parallel. Suff. ABCD not a parallelogram.
Show more


i'm not sure about this one - i've drawn something that would make 1 untrue but I don't know if it's a drawing of a real thing.

I do want to point out that a rhombus, square, or rectangle are all parallelograms, so if what anonymous is saying is true, then 1 would be sufficient also.
Guest
Joined: 31 Dec 1969
Last visit: -
Products:
GMAT Club Tests
Kudos: 0
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 19 Nov 2004, 00:30
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I still go by statement 1 being insuf, because, per statement1 it can also be a parallelogram. So, Statement 1 mean that it can be a parallelogram or it may not be. However statement 2 confirms that the a diagonal and a side is equal and thus the sides are not equal and thus CANNOT be a parallelogram.
User avatar
ian7777
User avatar
Joined: 09 Mar 2003
Last visit: 24 Jan 2010
Posts: 227
Own Kudos:
178
Posts: 227
Kudos: 178
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 19 Nov 2004, 00:53
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Anonymous
I still go by statement 1 being insuf, because, per statement1 it can also be a parallelogram. So, Statement 1 mean that it can be a parallelogram or it may not be. However statement 2 confirms that the a diagonal and a side is equal and thus the sides are not equal and thus CANNOT be a parallelogram.
Show more


Why? what about 2 equilateral triangles pushed up together? They make a rhombus, but that IS a parallelgram.
User avatar
Dookie
User avatar
Joined: 19 May 2004
Last visit: 07 Sep 2006
Posts: 144
Own Kudos:
35
Posts: 144
Kudos: 35
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 19 Nov 2004, 02:48
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I think it's E.
Attachments

File comment: Sketch
quad.jpg
quad.jpg [ 6.53 KiB | Viewed 2378 times ]

User avatar
artabro
User avatar
Joined: 15 Jul 2004
Last visit: 09 Jun 2005
Posts: 22
Own Kudos:
1
Location: London
Posts: 22
Kudos: 1
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 19 Nov 2004, 04:36
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I am with Dookie, I think it is E.


Two contiguous isosceles triangles ABC and ACD sharing side AC and with AB=AC=AD fulfil 1 and 2 conditions.
Attachments

drawing.doc [23.5 KiB]
Downloaded 112 times

User avatar
linker
User avatar
Joined: 25 Sep 2004
Last visit: 02 Dec 2004
Posts: 16
Own Kudos:
1,384
Posts: 16
Kudos: 1,384
In a quadrilateral ABCD, AC is a diagonal line. Is ABCD a 19 Nov 2004, 08:25
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Dookie
I think it's E.
Show more


Good solution dookie. OA is E



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Moderators:
Bunuel
Math Expert
110024 posts
GMATBusters
GMAT Tutor
1922 posts