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keeeeeekse
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The area of circle A is three times more than the circle of 27 Sep 2006, 06:14
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The area of circle A is three times more than the circle of circle B. If the circumference of circle B is 8, what is the circumference of circle A?

A. 8/3
B. 8/(3^1/2)
C. 3
D. 8(3^1/2)
E. 16

after trying several times, I still get the same answer, which is different from the official answer. let me know what you guys get

thanks



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The area of circle A is three times more than the circle of 27 Sep 2006, 06:34
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D. 8(3^1/2)


radius of B = 4/Pi
are of B = 16/Pi

Are of A = 3*16/Pi
radius of A = [4*3^(1/2)]/Pi

So circumference of circle A = 2*[4*3^(1/2)]/Pi * pi
cancel out Pi and you get 8*3^(1/2)
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The area of circle A is three times more than the circle of 27 Sep 2006, 07:02
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that's my answer too, but the official answer is E

I cannot find out why
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GMATT73
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The area of circle A is three times more than the circle of 27 Sep 2006, 07:18
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keeeeeekse
that's my answer too, but the official answer is E

I cannot find out why
Show more


Strange. I'm coming up with (D) too. :?
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ridhimagupta
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The area of circle A is three times more than the circle of 27 Sep 2006, 23:30
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I am getting D too and I tried so many times.

If someone figures out E please explain how.
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cicerone
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The area of circle A is three times more than the circle of Updated on: 25 Sep 2008, 01:17
Originally posted by cicerone on 28 Sep 2006, 00:10.
Last edited by cicerone on 25 Sep 2008, 01:17, edited 1 time in total.
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Hey folks, it must be 16. The OA is correct.

The area of circle A is three times more than the circle of circle B. If the circumference of circle B is 8, what is the circumference of circle A?


It is given that area is 3 times more and not 3 times of
which means area of A = 4 x Area of B( get the difference, or it is going to cost u a lot in the exam)

Given circumference of B = 8.
So it's area is 16/Pi

Now area of A = 4 x 16/Pi
ie Pi x R^2 = 64/Pi
ie R^2 = 64/(Pi)^2
ie R = 8/Pi

So circumference of A is 2 x Pi x 8/Pi = 16.

So the answer is E
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The area of circle A is three times more than the circle of 28 Sep 2006, 01:19
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OMG, what a trick!!!!

thanks for the enlightment cicerone!



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