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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]  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 [ 15.04 KiB | Viewed 190 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]  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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