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In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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14 Dec 2012, 03:31

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Two circles.png [ 5.47 KiB | Viewed 12779 times ]

In the figure above, points A, B, C, D, and E lie on a line. A is on both circles, B is the center of the smaller circle, C is the center of the larger circle, 0 is on the smaller circle, and E is on the larger circle. What is the area of the region inside the larger circle and outside the smaller circle?

In the figure above, points A, B, C, D, and E lie on a line. A is on both circles, B is the center of the smaller circle, C is the center of the larger circle, 0 is on the smaller circle, and E is on the larger circle. What is the area of the region inside the larger circle and outside the smaller circle?

We need to find the value of \(\pi{R^2}-\pi{r^2}\), where R is the radius of the larger circle and r is the radius of the smaller circle. So, bascally we need to find R and r.

(1) AB = 3 and BC = 2 --> \(AB=r=3\) and \(AB+BC=AC=5=R\). Sufficient.

(2) CD = 1 and DE = 4 --> \(CD+DE=CE=R=5\). Next, \(AD+DE=AE=DIAMETER=2R=10\), and since \(AD=2r\), then \(2r+DE=10\) --> \(2r+4=10\) --> \(r=3\). Sufficient.

Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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01 May 2014, 00:11

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Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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14 May 2014, 18:29

Kudos for the solution. I tried to solve the problem twice, but could not get it. I am hoping to start getting solutions to such problems with more practice

Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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31 May 2014, 03:28

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Hi Bunuel, There is a typo in the question stem. What you refer to as point O in question is shown by D in the diagram. FYKI. Thanks! _________________

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Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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13 Sep 2014, 12:35

In this question Why are we considering C towards left of D its not stated in the question that its in left of D its shown but not stated. C is given that its lie on the same line and its center of larger circle, But what if the C is towards right of D. Then we can not solve this question using only statement 2.

Should the diagram be considered as concrete not flexible?

In this question Why are we considering C towards left of D its not stated in the question that its in left of D its shown but not stated. C is given that its lie on the same line and its center of larger circle, But what if the C is towards right of D. Then we can not solve this question using only statement 2.

Should the diagram be considered as concrete not flexible?

OG13, page 272: A figure accompanying a data sufficiency problem will conform to the information given in the question but will not necessarily conform to the additional information given in statements (1) and (2). Lines shown as straight can be assumed to be straight and lines that appear jagged can also be assumed to be straight. You may assume that the positions of points, angles, regions, and so forth exist in the order shown and that angle measures are greater than zero degrees. All figures lie in a plane unless otherwise indicated.

OG13, page 150: Figures: A figure accompanying a problem solving question is intended to provide information useful in solving the problem. Figures are drawn as accurately as possible. Exceptions will be clearly noted. Lines shown as straight are straight, and lines that appear jagged are also straight. The positions of points, angles, regions, etc., exist in the order shown, and angle measures are greater than zero. All figures lie in a plane unless otherwise indicated.

Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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18 Sep 2014, 02:29

Bunuel wrote:

Parth Monga wrote:

In this question Why are we considering C towards left of D its not stated in the question that its in left of D its shown but not stated. C is given that its lie on the same line and its center of larger circle, But what if the C is towards right of D. Then we can not solve this question using only statement 2.

Should the diagram be considered as concrete not flexible?

OG13, page 272: A figure accompanying a data sufficiency problem will conform to the information given in the question but will not necessarily conform to the additional information given in statements (1) and (2). Lines shown as straight can be assumed to be straight and lines that appear jagged can also be assumed to be straight. You may assume that the positions of points, angles, regions, and so forth exist in the order shown and that angle measures are greater than zero degrees. All figures lie in a plane unless otherwise indicated.

OG13, page 150: Figures: A figure accompanying a problem solving question is intended to provide information useful in solving the problem. Figures are drawn as accurately as possible. Exceptions will be clearly noted. Lines shown as straight are straight, and lines that appear jagged are also straight. The positions of points, angles, regions, etc., exist in the order shown, and angle measures are greater than zero. All figures lie in a plane unless otherwise indicated.

Hope it helps.

This a lot Bunuel that solves my concern with this question. Thanks a lot for your help. P.S. the content provided in your signature is quite good and helpful. Really appreciate your work and effort.

In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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18 Sep 2014, 14:11

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From the figure we know that: B is the center of the smaller circle C is the center of the larger circle We have to find out area of region i.e area obtained when area of the smaller circle removed from area of the larger circle.

Statement 1

AB=3 and BC= 2

from this statement we know radius of the smaller circle i.e 3(AB) and radius of the larger circle as well \(3+2=5 (AB+BC)\) using radius of both the circle we can find the area of each circle and hence the required area. Sufficient

Statement 2

CD=1 and DE=4

from this statement we know that radius of the larger circle is \(1+4=5 (CD+DE)\) now for the smaller circle,we know that AE=10 and we know DE=4. therefore diameter of the smaller circle is \(10(AE)-4(DE)=6 (AC)\) therefore radius of the smaller circle \(= 3 (\frac{AC}{2})\). using radius of both the circle we can find the area of each circle and hence the required area. Sufficient

Answer D

Last edited by AayushGMAT on 26 Oct 2015, 01:23, edited 1 time in total.

Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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27 Sep 2014, 01:08

Walkabout wrote:

Attachment:

Two circles.png

In the figure above, points A, B, C, D, and E lie on a line. A is on both circles, B is the center of the smaller circle, C is the center of the larger circle, 0 is on the smaller circle, and E is on the larger circle. What is the area of the region inside the larger circle and outside the smaller circle?

(1) AB = 3 and BC = 2 (2) CD = 1 and DE = 4

A - clearly sufficient B- cd+de= radius so smaller circle can also be found if you use it in opposite direcetion - sufficient OA:D _________________

Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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07 Nov 2014, 07:50

Bunuel wrote:

Turkish wrote:

I have one question, how do we know CE is the diameter. The problem never says it is?

CE is the radius of the large circle because C is its center and E is on its circumference.

Sorry Bunuel may be I am not getting this. In the problem it never say E is one the circumference, It says E is on larger circle. Should we believe in what we see,even if its not mentioned?

I have one question, how do we know CE is the diameter. The problem never says it is?

CE is the radius of the large circle because C is its center and E is on its circumference.

Sorry Bunuel may be I am not getting this. In the problem it never say E is one the circumference, It says E is on larger circle. Should we believe in what we see,even if its not mentioned?

E is on the larger circle means that E is on the circumference. _________________

Re: In the figure above, points A, B, C, 0, and E lie on a line [#permalink]

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14 Jul 2015, 05:57

We need to find AREA (BIG)-(SMALL) --> P*R^2 - P*R^2 1) AB=3, BC=2, R(big)=3+2=5, R(small)=3 Sufficient 2) CD=1, DE=4, Diameter of the big circle = CD+DE=5, Diameter of the small circle = AC+CD=5+1=6, Radius =3 Sufficient _________________

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