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The circumference of circle C1 is 12π and the circumference of circle

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Math Expert
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Joined: 02 Sep 2009
Posts: 55150
The circumference of circle C1 is 12π and the circumference of circle  [#permalink]

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New post 27 Nov 2018, 00:02
1
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

91% (01:09) correct 9% (01:30) wrong based on 28 sessions

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Joined: 18 Jul 2018
Posts: 897
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
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Re: The circumference of circle C1 is 12π and the circumference of circle  [#permalink]

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New post 28 Nov 2018, 01:14
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Circumference C1 = 12π = 2πr, then r = 6.
Circumference C2 = 24π = 2πr, then r = 12.

\(\frac{Area of C_2}{Area of C_1}\) = \(\frac{πr_2^2}{πr_1^2}\) = \(\frac{12*12}{6*6}\) = 4/1

C is the answer.
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Re: The circumference of circle C1 is 12π and the circumference of circle   [#permalink] 28 Nov 2018, 01:14
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The circumference of circle C1 is 12π and the circumference of circle

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