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# In the figure four concentric circles are shown, is the area of the sh

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Math Expert
Joined: 02 Sep 2009
Posts: 58445
In the figure four concentric circles are shown, is the area of the sh  [#permalink]

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02 Sep 2018, 22:18
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Difficulty:

25% (medium)

Question Stats:

92% (01:18) correct 8% (00:22) wrong based on 15 sessions

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In the figure four concentric circles are shown, is the area of the shaded region greater than the area of the unshaded region?

(1) The radii of the two smallest circles are 1 and 2, respectively.
(2) The circumferences of the two largest circles are 6π and 8π, respectively.

Attachment:

image018.gif [ 1.26 KiB | Viewed 376 times ]

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Re: In the figure four concentric circles are shown, is the area of the sh  [#permalink]

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02 Sep 2018, 23:36
1
Bunuel wrote:

In the figure four concentric circles are shown, is the area of the shaded region greater than the area of the unshaded region?

(1) The radii of the two smallest circles are 1 and 2, respectively.
(2) The circumferences of the two largest circles are 6π and 8π, respectively.

Attachment:
image018.gif
St1) The figure is not restricted. The outer two circles can assume any value.

Not suff.

St2) The figure is not restricted. The inner two circles can assume any value.

Combining
The figure is restricted. So we will have a definite answer.
Sufficient

C

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Re: In the figure four concentric circles are shown, is the area of the sh   [#permalink] 02 Sep 2018, 23:36
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