What is the area of circle O above? : GMAT Problem Solving (PS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 22 Feb 2017, 12:14

### 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

# Events & Promotions

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

# What is the area of circle O above?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 10 Jul 2013
Posts: 335
Followers: 3

Kudos [?]: 321 [0], given: 102

What is the area of circle O above? [#permalink]

### Show Tags

25 Aug 2013, 16:45
00:00

Difficulty:

25% (medium)

Question Stats:

75% (01:00) correct 25% (01:28) wrong based on 85 sessions

### HideShow timer Statistics

Attachment:

circle 2.png [ 4.3 KiB | Viewed 1694 times ]
What is the area of circle O above?

(A) 24π
(B) 36π
(C) 48π
(D) 64π
(E) 72π

[Reveal] Spoiler:
a real-different sort of problem
[Reveal] Spoiler: OA

_________________

Asif vai.....

Last edited by Bunuel on 25 Aug 2013, 22:20, edited 1 time in total.
Edited the question.
Math Expert
Joined: 02 Sep 2009
Posts: 37083
Followers: 7243

Kudos [?]: 96328 [1] , given: 10737

Re: What is the area of circle O above? [#permalink]

### Show Tags

25 Aug 2013, 22:23
1
This post received
KUDOS
Expert's post

What is the area of circle O above?

(A) 24π
(B) 36π
(C) 48π
(D) 64π
(E) 72π

Notice that ABCO is a rectangle --> diagonal AC = diagonal OB = 6.

Since OB is the radius of the circle, then the area is $$\pi{r^2}=36\pi$$.

Answer: B.
_________________
Intern
Joined: 31 Jan 2013
Posts: 17
Schools: ISB '15
WE: Consulting (Energy and Utilities)
Followers: 0

Kudos [?]: 47 [1] , given: 18

Re: What is the area of circle O above? [#permalink]

### Show Tags

25 Aug 2013, 23:04
1
This post received
KUDOS
In the Quadilateral(OABC), since Ang(O),Ang(B), and Ang(C) are Right angles, Ang(A) also must be right angle.
(Since sum of interior angles of a Quadilateral = (n-2) * 180 where n = number of sides)

Hence we could say, Quadilateral(OABC) is a Rectangle.

Using the properties of Rectangle, AC = OB = 6

Hence Area of the Circle = Pi* OB^2=
[Reveal] Spoiler:
Pi * 6^2=36Pi
Senior Manager
Joined: 10 Jul 2013
Posts: 335
Followers: 3

Kudos [?]: 321 [0], given: 102

Re: What is the area of circle O above? [#permalink]

### Show Tags

26 Aug 2013, 00:13
Smallwonder wrote:
In the Quadilateral(OABC), since Ang(O),Ang(B), and Ang(C) are Right angles, Ang(A) also must be right angle.
(Since sum of interior angles of a Quadilateral = (n-2) * 180 where n = number of sides)

Hence we could say, Quadilateral(OABC) is a Rectangle.

Using the properties of Rectangle, AC = OB = 6

Hence Area of the Circle = Pi* OB^2=
[Reveal] Spoiler:
Pi * 6^2=36Pi

it's not locked brother. you can comment here as you did.
Already this post received expert advice. it's not locked...

however , nice solution
_________________

Asif vai.....

Re: What is the area of circle O above?   [#permalink] 26 Aug 2013, 00:13
Similar topics Replies Last post
Similar
Topics:
If O is the center of the circle in the figure above and the area of I 6 19 Oct 2016, 22:41
3 What is the area of the shaded portion in circle O, as pictured above, 3 06 Feb 2016, 16:17
Circle O is inscribed in square ABCD as shown above. The area of the s 1 10 Jan 2016, 07:10
What is the area of circle O? 3 23 Apr 2013, 00:35
8 If O is the center of the circle above, what fraction of the 13 11 Sep 2012, 03:33
Display posts from previous: Sort by

# What is the area of circle O above?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.