Find all School-related info fast with the new School-Specific MBA Forum

It is currently 30 Sep 2014, 20:21

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

O is the center of the circle above, OB=2, and angle AOB

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 25 Jul 2012
Posts: 81
Location: United States
Followers: 0

Kudos [?]: 18 [0], given: 137

O is the center of the circle above, OB=2, and angle AOB [#permalink] New post 17 Aug 2013, 10:32
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

66% (02:21) correct 34% (01:22) wrong based on 102 sessions
Image

O is the center of the circle above, OB=2, and angle AOB measures 120 degrees. What is the area of the triangular region AOB?

a) 1

b) 2

c) (sq root 3) /2

d) sq root 3

e) 2(sq root 3)




Source: GMAT Prep Question Pack 1
Difficulty: Hard
[Reveal] Spoiler: OA

Attachments

File comment: Circle
Screen Shot 2013-08-17 at 2.24.00 PM.png
Screen Shot 2013-08-17 at 2.24.00 PM.png [ 11.85 KiB | Viewed 1729 times ]


_________________

If my post has contributed to your learning or teaching in any way, feel free to hit the kudos button ^_^

Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
1 KUDOS received
Current Student
User avatar
Joined: 14 Dec 2012
Posts: 838
Location: India
Concentration: General Management, Operations
GMAT 1: 700 Q50 V34
GPA: 3.6
Followers: 37

Kudos [?]: 597 [1] , given: 197

GMAT ToolKit User
Re: O is the center of the circle above, OB=2, and angle AOB [#permalink] New post 17 Aug 2013, 10:44
1
This post received
KUDOS
DelSingh wrote:
Image

O is the center of the circle above, OB=2, and angle AOB measures 120 degrees. What is the area of the triangular region AOB?

a) 1

b) 2

c) (sq root 3) /2

d) sq root 3

e) 2(sq root 3)




Source: GMAT Prep Question Pack 1
Difficulty: Hard

SINCE ANGLE AT CENTRE = 120
when you draw perpendicular OC on AB
it divides in two equal 30 - 60 - 90 triangle see figure
sides are in ratio of1: \sqrt{3}: 2
therefore OC = 1 and CA = CB = \sqrt{3}
THEREFORE AB = 2\sqrt{3}
Hence AREA Of triangle = 1/2*base*height
= 1/2 * 2\sqrt{3}*1 = \sqrt{3}
hence D
Attachments

circle.png
circle.png [ 13.72 KiB | Viewed 1304 times ]


_________________

When you want to succeed as bad as you want to breathe ...then you will be successfull....

GIVE VALUE TO OFFICIAL QUESTIONS...



GMAT RCs VOCABULARY LIST: vocabulary-list-for-gmat-reading-comprehension-155228.html
learn AWA writing techniques while watching video : http://www.gmatprepnow.com/module/gmat- ... assessment
: http://www.youtube.com/watch?v=APt9ITygGss

Intern
Intern
avatar
Joined: 28 Jan 2013
Posts: 34
Followers: 0

Kudos [?]: 15 [0], given: 20

Re: O is the center of the circle above, OB=2, and angle AOB [#permalink] New post 18 Aug 2013, 08:32
Here radius is the side of the triangle. So, Area of the traingle = (1/2)*r*r*sin(angle between those two sides)
so area = (1/2)*2*2*sin120 = (1/2)*2*2*sin60 = sqrt3.
CEO
CEO
User avatar
Joined: 09 Sep 2013
Posts: 2552
Followers: 200

Kudos [?]: 40 [0], given: 0

Premium Member
Re: O is the center of the circle above, OB=2, and angle AOB [#permalink] New post 31 Aug 2014, 17:19
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 Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: O is the center of the circle above, OB=2, and angle AOB   [#permalink] 31 Aug 2014, 17:19
    Similar topics Author Replies Last post
Similar
Topics:
In the figure above, O is the center of the circle. If OP an fozzzy 0 08 Sep 2013, 00:38
Experts publish their posts in the topic In the diagram above, O is the center of the circle mikemcgarry 1 01 May 2013, 09:40
2 In the circle with center O above, chord QS is perpendicular matspring 1 27 Mar 2013, 03:05
4 Experts publish their posts in the topic If O is the center of the circle above, what fraction of the Bunuel 8 11 Sep 2012, 03:33
15 Experts publish their posts in the topic In the figure above, the radius of circle with center O is 1 over2u 14 27 Aug 2009, 11:03
Display posts from previous: Sort by

O is the center of the circle above, OB=2, and angle AOB

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.