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What is the circumference of the circle above?

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Director
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Re: What is the circumference of the circle above?  [#permalink]

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New post 14 Mar 2017, 14:30
Bunuel - is my reasoning my valid? I want to make sure there's no lapse in my math- some problems I get right but for some reason I use methods that actually logically mathematically false. I do not come from a heavy math background, so I would like to learn how to also reason through problems and the language of math.
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Re: What is the circumference of the circle above?  [#permalink]

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New post 14 Mar 2017, 21:28
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Re: What is the circumference of the circle above?  [#permalink]

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New post 15 Mar 2017, 01:42
St 1: arc length = angle on the center/180 x pi*r. angle and the radius not given. INSUFFICIENT
St 2: r = s. therefore r = s = 60. angle at the center is 120. no information about any length is mentioned. INSUFFICIENT

St 1 & St 2: putting the angle as 120 in the equation in statement 1, we get r = 27/pi. hence the circumference = 2*pi*r = 2*pi*27/pi = 54. ANSWER

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Re: What is the circumference of the circle above?  [#permalink]

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New post 17 Oct 2018, 14:35
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: What is the circumference of the circle above?   [#permalink] 17 Oct 2018, 14:35

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