Last visit was: 10 Jul 2025, 09:40 It is currently 10 Jul 2025, 09:40
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.
Close
Request Expert Reply
Confirm Cancel
User avatar
DHAR
Joined: 15 Dec 2015
Last visit: 13 Dec 2021
Posts: 92
Own Kudos:
909
 [13]
Given Kudos: 83
GMAT 1: 680 Q49 V34
GPA: 4
WE:Information Technology (Computer Software)
GMAT 1: 680 Q49 V34
Posts: 92
Kudos: 909
 [13]
2
Kudos
Add Kudos
11
Bookmarks
Bookmark this Post
User avatar
DHAR
Joined: 15 Dec 2015
Last visit: 13 Dec 2021
Posts: 92
Own Kudos:
909
 [3]
Given Kudos: 83
GMAT 1: 680 Q49 V34
GPA: 4
WE:Information Technology (Computer Software)
GMAT 1: 680 Q49 V34
Posts: 92
Kudos: 909
 [3]
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
User avatar
chetan2u
User avatar
GMAT Expert
Joined: 02 Aug 2009
Last visit: 09 Jul 2025
Posts: 11,295
Own Kudos:
41,657
 [1]
Given Kudos: 333
Status:Math and DI Expert
Products:
Expert
Expert reply
Posts: 11,295
Kudos: 41,657
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
avatar
AMOGH1010
Joined: 24 Feb 2020
Last visit: 24 Apr 2022
Posts: 15
Own Kudos:
Given Kudos: 14
Posts: 15
Kudos: 3
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I actually have a doubt imagining case (a) here. If angles A and C are 90 degrees each . Wouldn’t that enforce angle angles B and D each to be 90 degree again?

Posted from my mobile device
User avatar
GMATinsight
User avatar
Major Poster
Joined: 08 Jul 2010
Last visit: 09 Jul 2025
Posts: 6,375
Own Kudos:
15,572
 [1]
Given Kudos: 128
Status:GMAT/GRE Tutor l Admission Consultant l On-Demand Course creator
Location: India
GMAT: QUANT+DI EXPERT
Schools: IIM (A) ISB '24
GMAT 1: 750 Q51 V41
WE:Education (Education)
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Schools: IIM (A) ISB '24
GMAT 1: 750 Q51 V41
Posts: 6,375
Kudos: 15,572
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
AMOGH1010
I actually have a doubt imagining case (a) here. If angles A and C are 90 degrees each . Wouldn’t that enforce angle angles B and D each to be 90 degree again?

Posted from my mobile device


Refer the following case

Here two angles are 90º but remaining 2 are NOT
Attachments

Screenshot 2020-04-28 at 7.59.11 PM.png
Screenshot 2020-04-28 at 7.59.11 PM.png [ 263.03 KiB | Viewed 5072 times ]

User avatar
GMATinsight
User avatar
Major Poster
Joined: 08 Jul 2010
Last visit: 09 Jul 2025
Posts: 6,375
Own Kudos:
15,572
 [1]
Given Kudos: 128
Status:GMAT/GRE Tutor l Admission Consultant l On-Demand Course creator
Location: India
GMAT: QUANT+DI EXPERT
Schools: IIM (A) ISB '24
GMAT 1: 750 Q51 V41
WE:Education (Education)
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Schools: IIM (A) ISB '24
GMAT 1: 750 Q51 V41
Posts: 6,375
Kudos: 15,572
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
AMOGH1010
I actually have a doubt imagining case (a) here. If angles A and C are 90 degrees each . Wouldn’t that enforce angle angles B and D each to be 90 degree again?

Posted from my mobile device


Refer the following case

Here two angles are 90º but remaining 2 are NOT

AMOGH1010
Attachments

Screenshot 2020-04-28 at 7.59.11 PM.png
Screenshot 2020-04-28 at 7.59.11 PM.png [ 263.03 KiB | Viewed 4926 times ]

User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 37,374
Own Kudos:
Posts: 37,374
Kudos: 1,010
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Moderator:
Math Expert
102619 posts