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If the number of square units in the area of circle С is twice the num

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If the number of square units in the area of circle С is twice the num  [#permalink]

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New post 09 Mar 2011, 08:16
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Question Stats:

61% (01:25) correct 39% (01:34) wrong based on 96 sessions

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If the number of square units in the area of circle С is twice the number of linear units in the circumference of C, what is the number of square units in the area?

(A) 4
(B) 8
(C) 4pi
(D) 8pi
(E) 16pi
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Re: If the number of square units in the area of circle С is twice the num  [#permalink]

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New post 09 Mar 2011, 08:52
banksy wrote:
252. If the number of square units in the area of circle С is twice the number of linear units in the circumference of C, what is the number of square units in the area?
(A) 4
(B) 8
(C) 4pi
(D) 8pi
(E) 16pi


Given: \(area=\pi{r^2}=x\) and \(circumference=2\pi{r}=\frac{x}{2}\). Question: \(x=?\)

\(\pi{r^2}=2*2\pi{r}\) --> \(r=4\) --> \(area=\pi{r^2}=16\pi=x\).

Answer: E.
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Re: If the number of square units in the area of circle С is twice the num  [#permalink]

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New post 29 Nov 2018, 17:31
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Re: If the number of square units in the area of circle С is twice the num   [#permalink] 29 Nov 2018, 17:31
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