Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Sep 0201:00 PM EDT
-11:59 PM EDT
Take 30% off all study plans with code COURSEWORK - Expires on Monday 9/7
Sep 0410:00 AM EDT
-11:59 PM EDT
We’ve worked incredibly hard to build TTP into the best test prep experience possible, and it would mean a lot to us to win Newsweek’s 2026 Readers’ Choice Award for Best Test Prep. If TTP has helped you, we’d be incredibly grateful for your vote.
Sep 0712:01 AM PDT
-11:59 PM PDT
On the 7th, GMAT Club Tests will be Free! Including all the Quizzes, Questions, and Tests. 12 AM - 11:59 PM PDT- Sep 07
10:00 AM PDT
-11:00 AM PDT
A complete walkthrough of GMAT Club’s free 12-week GMAT study plan: what you study each week, how progress and goals are tracked, how the error log works, and how your practice unlocks paid tools at no cost. - Sep 09
07:00 AM PDT
-10:00 AM PDT
Meet AdComs and explore top Master’s programs - MiM, MiF, MSc, MSBA and more. - Application Fee Waivers - Free 1-Week of GMAT Club Tests: - Master's Application Toolkit - Grand Prize Giveaway - Sep 09
10:00 AM PDT
-11:00 AM PDT
Three MBA applications. Three rejections. No interview invites. A year later, Aman was admitted to Cambridge Judge, SMU, and IMD. In this episode of MBA Admit Stories, Aman shares how he rebuilt his MBA application... 
Sep 1507:00 PM EDT
-09:00 PM EST
Elite scores are possible when you enroll in a powerful GMAT course, taught live online + 6 months access to TTP OnDemand video courses included! Class starts Tues/Thurs Sept. 15, 2026 - Nov. 15, 2027, 7:00pm-9:00pm EST
Sep 2108:00 PM EDT
-10:00 PM EDT
Boost your GMAT score in less than one month in a live online class + 6 months access to TTP OnDemand video courses included! Class starts Mon, Tues, Wed, Thur, Fri Sept. 21, 2026 - Oct. 9, 2027, 7:00pm-10:00pm EST
15 May 2012, 13:43
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
80% (02:10) correct
20%
(03:02)
wrong
based on 149
sessions
History
Date
Time
Result
Not Attempted Yet
The area of Circle O is added to its diameter. If the circumference of Circle O is then subtracted from this total, the result is 4. What is the radius of Circle O?
A. 2/π
B. 2
C. 3
D. 4
E. 5
A. 2/π
B. 2
C. 3
D. 4
E. 5
16 May 2012, 03:28
Kudos
Bookmarks
alexpavlos
Given: area+diameter-circumference=4 --> \(\pi{r^2}+2r-2\pi{r}=4\) --> \((\pi{r^2}-2\pi{r})+(2r-4)=\) --> \(\pi{r}({r-2)+2(r-2)=0\) --> \((r-2)(\pi{r}+2)=0\) --> either \(r=2\) or \(r=-\frac{2}{\pi}\), which is not a valid solution since the value of the radius cannot be negative.
Answer: B.
29 Sep 2014, 01:52
Kudos
Bookmarks
Area + Diameter - Circumference = 4
Just observe the above setup equation in terms of circle
Area calculation always involves the \(\pi\) factor. Example, \(\pi r^2\) etc for whatever the radius may be.
Similarly, Circumference calculation always involves again the \(\pi\) factor. Example, \(2\pi r\) for whatever the radius may be.
Now the resultant of all this ideally should have a \(\pi\). However , the resultant returned = 4.
It means the \(\pi\) factor is cancelled out in the calculation which also means Area of the given circle = circumference of the given circle.
Area of Circle = Circumference of circle: Happens only when Radius = 2
In this case, Diameter = 4; so \(radius = \frac{4}{2} = 2\)
Answer = B
Bunuel/Experts: Kindly let me know if above argument holds value for calculation purpose in this question? Thank you
Just observe the above setup equation in terms of circle
Area calculation always involves the \(\pi\) factor. Example, \(\pi r^2\) etc for whatever the radius may be.
Similarly, Circumference calculation always involves again the \(\pi\) factor. Example, \(2\pi r\) for whatever the radius may be.
Now the resultant of all this ideally should have a \(\pi\). However , the resultant returned = 4.
It means the \(\pi\) factor is cancelled out in the calculation which also means Area of the given circle = circumference of the given circle.
Area of Circle = Circumference of circle: Happens only when Radius = 2
In this case, Diameter = 4; so \(radius = \frac{4}{2} = 2\)
Answer = B
Bunuel/Experts: Kindly let me know if above argument holds value for calculation purpose in this question? Thank you
