Geometry Circumference : Ask GMAT Experts
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 19 Jan 2017, 02:59

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Geometry Circumference

Author Message
Intern
Joined: 13 Mar 2012
Posts: 2
Followers: 0

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

### Show Tags

18 Apr 2012, 17:42
Attachment:
File comment: Need help in solving

GMAT.JPG [ 1.76 MiB | Viewed 858 times ]

need help solving
SVP
Joined: 16 Nov 2010
Posts: 1672
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 33

Kudos [?]: 514 [0], given: 36

### Show Tags

18 Apr 2012, 18:36
From figure, AB = 5 inches

And triangle AOB is an equilateral triangle, because angle OAB = angle OBA

=> angle OAB = (180 - AOB )/2 = 60 degrees

Now, AB = OA = OB = 5 inches, because triangle AOB is an equilateral triangle

So radius of circle is 5 inches

And circumference = 2 * pi * 5

= 10pi

Hope this helps
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

GMAT Club Premium Membership - big benefits and savings

Intern
Joined: 22 Jan 2012
Posts: 35
Followers: 0

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

### Show Tags

18 Apr 2012, 19:20
In triangle AOB,

angle AOB=60,
OA=OB =radius of the circle therefore, angle OAB=angle OBA
thereby angle OAB=angle OBA = (180-angle AOB )/2 =60

Since all angles in the triangle are 60 , so it is an equilateral triangle with each side equal .
So, OA=OB=AB = 5

circumference = 2* pi *r = 10 pi

Ans :A
Re: Geometry Circumference   [#permalink] 18 Apr 2012, 19:20
Similar topics Replies Last post
Similar
Topics:
Geometry 5 04 Oct 2013, 10:14
Geometry help 2 22 Jun 2013, 14:00
geometry helppppp 2 17 Aug 2012, 02:56
geometry helppppp 3 08 Aug 2012, 13:07
Geometry Problem URGENTTTTTT 1 10 Nov 2011, 07:54
Display posts from previous: Sort by