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The figure below shows two concentric circles, each with cent

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The figure below shows two concentric circles, each with cent [#permalink] New post 26 May 2019, 10:26
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The figure below shows two concentric circles, each with center O. Given that the larger circle has radius 12 and the smaller circle has radius 7, find the following.

(a) Circumference of the larger circle

(b) Area of the smaller circle

(c) Area of the shaded region


Attachment:
#GREexcercise The figure below shows two concentric circles.jpg
#GREexcercise The figure below shows two concentric circles.jpg [ 15.04 KiB | Viewed 3898 times ]


[Reveal] Spoiler: OA
(a) \(24\pi\) (b) \(49\pi\) (c) \(95\pi\)


Math Review
Question: 13
Page: 261
Difficulty: medium

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Re: The figure below shows two concentric circles, each with cent [#permalink] New post 26 May 2019, 18:44
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Carcass wrote:
The figure below shows two concentric circles, each with center O. Given that the larger circle has radius 12 and the smaller circle has radius 7, find the following.

(a) Circumference of the larger circle

(b) Area of the smaller circle

(c) Area of the shaded region


[Reveal] Spoiler: OA
(a) \(24\pi\) (b) \(49\pi\) (c) \(95\pi\)


Math Review



Question: 13
Page: 261
Difficulty: medium



Here,

Circumference of the larger square = \(2\pi * radius = 2 \pi * 12 = 24\pi\)

Area of the smaller circle = \(\pi * radius^2 = \pi * 7^2 = 49\pi\)

Area of the shaded region = Area of the larger circle - area of the smaller circle = \(144\pi - 49\pi = 95\pi\)
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Re: The figure below shows two concentric circles, each with cent   [#permalink] 26 May 2019, 18:44
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The figure below shows two concentric circles, each with cent

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