NEW HERE? LEARN MORE
closeclose
Last visit was: 25 Apr 2024, 12:09 It is currently 25 Apr 2024, 12:09
Decision Tracker
My Rewards
New posts
New comers' posts

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

In the fi…gure, what is the value of y

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
metallicafan
Retired Moderator
Joined: 04 Oct 2009
Status:2000 posts! I don't know whether I should feel great or sad about it! LOL
Posts: 767
Own Kudos [?]: 3947 [2]
Given Kudos: 109
Location: Peru
Concentration: Finance, SMEs, Developing countries, Public sector and non profit organizations
Schools:Harvard, Stanford, Wharton, MIT & HKS (Government)
GPA: 4.0
WE 1: Economic research
WE 2: Banking
WE 3: Government: Foreign Trade and SMEs
Send PM
In the fi…gure, what is the value of y [#permalink] New post   06 Jul 2012, 10:12
2
Bookmarks
00:00
A
B
C
D
E

Difficulty:

45% (medium)

Question Stats:

65% (01:36) correct 35% (01:15) wrong based on 60 sessions
Hide Show timer Statistics
In the fi…gure, what is the value of y?

(1) \(y = 2x\)
(2) Angle DCA = 30

If y = 2x, doesn't it mean that triangle ABC is inscribed in a circle? Angle ABC would be in the center, and angle ABC would be an inscribed angle.

Source: https://www.gmathacks.com
ShowHide Answer
Official Answer
E

Attachments

68-geometry-f.png
68-geometry-f.png [ 10.63 KiB | Viewed 3999 times ]

User avatar
B
cyberjadugar
Senior Manager
Senior Manager
Joined: 29 Mar 2012
Posts: 267
Own Kudos [?]: 1492 [0]
Given Kudos: 23
Location: India
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q50 V28
GMAT 3: 730 Q50 V38
Send PM
GMAT ToolKit User
Re: In the fi…gure, what is the value of y [#permalink] New post   06 Jul 2012, 13:25
Hi,

You will find the explanation here:
https://gmatclub.com/forum/what-is-the-area-of-circle-passing-points-a-b-c-in-the-134911.html

Regards,
User avatar
ashish8
Intern
Intern
Joined: 28 Sep 2011
Posts: 47
Own Kudos [?]: 85 [0]
Given Kudos: 10
Location: United States
GMAT 1: 520 Q34 V27
GMAT 2: 690 Q47 V38
GPA: 3.01
WE:Information Technology (Commercial Banking)
Send PM
GMAT ToolKit User
Re: In the fi…gure, what is the value of y [#permalink] New post   06 Jul 2012, 19:29
I still don't understand why the answer is not C.
User avatar
bschooladmit
Manager
Manager
Joined: 11 May 2012
Status:Juggg..Jugggg Go!
Posts: 159
Own Kudos [?]: 98 [0]
Given Kudos: 239
Location: India
GC Meter: A.W.E.S.O.M.E
Concentration: Entrepreneurship, General Management
GMAT 1: 620 Q46 V30
GMAT 2: 720 Q50 V38
Send PM
Reviews Badge
Re: In the fi…gure, what is the value of y [#permalink] New post   06 Jul 2012, 21:06
Please don't assume things by yourself. That's the worst thing one can do on a GMAT. What you see can be misleading. Don't let it.
Given:
a. Y=2x => Nothing. Because D can be any where within the triangle. One such point is where you said - circle scenario. Remember in circle scenario the radius are equal. Here, you cannot assume that. Hence, Insuff.
b. angle DCA = 30. Again here, since we don't know AD=DC, or if DC is angular bisector. Therefore, insuff.
c. Together, still insuff because we still don't know value of angle DAC.


Answer E.
User avatar
pike
Current Student
Joined: 08 Jan 2009
Posts: 245
Own Kudos [?]: 441 [0]
Given Kudos: 7
GMAT 1: 770 Q50 V46
Send PM
Re: In the fi…gure, what is the value of y [#permalink] New post   06 Jul 2012, 21:39
metallicafan wrote:

If y = 2x, doesn't it mean that triangle ABC is inscribed in a circle? Angle ABC would be in the center, and angle ABC would be an inscribed angle.


All triangles can be inscribed in a circle, it doesn't follow that ABC is in the centre.

See https://www.mathopenref.com/trianglecircumcircle.html
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32676
Own Kudos [?]: 822 [0]
Given Kudos: 0
Send PM
Re: In the fi…gure, what is the value of y [#permalink] New post   26 Aug 2016, 08:06
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.
GMAT Club Bot
gmatclubot
Re: In the fi…gure, what is the value of y [#permalink]
26 Aug 2016, 08:06
Moderator:
Bunuel
Math Expert
92914 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions