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# What is the difference between the circumferences of 2 circles such th

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6815
GMAT 1: 760 Q51 V42
GPA: 3.82
What is the difference between the circumferences of 2 circles such th  [#permalink]

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09 Feb 2017, 04:24
00:00

Difficulty:

5% (low)

Question Stats:

91% (00:45) correct 9% (00:38) wrong based on 55 sessions

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What is the difference between the circumferences of 2 circles such that the diameters of the circles are 10 and 11?

A. $$\frac{π}{2}$$
B. $$π$$
C. $$3\frac{π}{2}$$
D. $$2π$$
E. $$5\frac{π}{2}$$

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $149 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Senior Manager Joined: 19 Apr 2016 Posts: 274 Location: India GMAT 1: 570 Q48 V22 GMAT 2: 640 Q49 V28 GPA: 3.5 WE: Web Development (Computer Software) Re: What is the difference between the circumferences of 2 circles such th [#permalink] ### Show Tags 09 Feb 2017, 04:28 MathRevolution wrote: What is the difference between the circumferences of 2 circles such that the diameters of the circles are 10 and 11? A. $$\frac{π}{2}$$ B. $$π$$ C. $$3\frac{π}{2}$$ D. $$2π$$ E. $$5\frac{π}{2}$$ difference between the circumferences of 2 circles such that the diameters of the circles are 10 and 11 = 11$$π$$ - 10$$π$$ = $$π$$ Hence Option B is correct. Hit Kudos if you liked it Senior Manager Joined: 24 Apr 2016 Posts: 331 Re: What is the difference between the circumferences of 2 circles such th [#permalink] ### Show Tags 09 Feb 2017, 13:30 Circumference = π D Difference = πD1 - πD2 = 11π - 10π = π Answer = B Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 6815 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: What is the difference between the circumferences of 2 circles such th [#permalink] ### Show Tags 12 Feb 2017, 17:24 ==> The circumference of a circle is $$π$$d, thus $$π(11-10)= π$$. Therefore, the answer is B. Answer: B _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$149 for 3 month Online Course"
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Target Test Prep Representative
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2830
Re: What is the difference between the circumferences of 2 circles such th  [#permalink]

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13 Feb 2017, 16:08
MathRevolution wrote:
What is the difference between the circumferences of 2 circles such that the diameters of the circles are 10 and 11?

A. $$\frac{π}{2}$$
B. $$π$$
C. $$3\frac{π}{2}$$
D. $$2π$$
E. $$5\frac{π}{2}$$

The circumference of the circle with a diameter of 10 is 10π, and the circumference of the circle with a diameter of 11 is 11π.

Thus, the difference is 11π - 10π = π.

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Jeffery Miller

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Re: What is the difference between the circumferences of 2 circles such th &nbs [#permalink] 13 Feb 2017, 16:08
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