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In the given figure, the area of the equilateral triangle is [#permalink]
15 Sep 2013, 09:08

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Question Stats:

71% (03:39) correct
29% (02:55) wrong based on 62 sessions

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In the given figure, the area of the equilateral triangle is 48. If the other three figures are squares, what is the perimeter, approximately, of the nine-sided shape they form?

A) \(8\sqrt{2}\) B) \(24\sqrt{3}\) C) \(72\sqrt{2}\) D) \(144\sqrt{2}\) E) \(384\)

Re: In the given figure, the area of the equilateral triangle is [#permalink]
15 Sep 2013, 11:29

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Expert's post

In the given figure, the area of the equilateral triangle is 48. If the other three figures are squares, what is the perimeter, approximately, of the nine-sided shape they form?

A) \(8\sqrt{2}\) B) \(24\sqrt{3}\) C) \(72\sqrt{2}\) D) \(144\sqrt{2}\) E) \(384\)

The area of equilateral triangle is \(side^2*\frac{\sqrt{3}}{4}\).

So, we are given that \(side^2*\frac{\sqrt{3}}{4}=48\) --> \(side^2=64\sqrt{3}\) --> \(side=8\sqrt[4]{3}\).

The perimeter = \(9*8\sqrt[4]{3}=72\sqrt[4]{3}\) --> \(\sqrt[4]{3}\approx{\sqrt{2}}\).

Re: In the given figure, the area of the equilateral triangle is [#permalink]
13 Feb 2014, 02:49

Hi Bunuel the question is really how can we understand the value of \(3^{1/4} = \sqrt{2}\) ??

I was stuck at this point as well. How does \(9*8*(3)^{1/4}\) convert to \(9*8*\sqrt{2}\) It may be something very small but I am not able to wrap my head around it.

Bunuel wrote:

madn800 wrote:

Buneul, how did you estimate \(fourth\sqrt{3}\)=\(\sqrt{2}\)?

Re: In the given figure, the area of the equilateral triangle is [#permalink]
13 Feb 2014, 05:50

Expert's post

gmatprav wrote:

Hi Bunuel the question is really how can we understand the value of \(3^{1/4} = \sqrt{2}\) ??

I was stuck at this point as well. How does \(9*8*(3)^{1/4}\) convert to \(9*8*\sqrt{2}\) It may be something very small but I am not able to wrap my head around it.

Bunuel wrote:

madn800 wrote:

Buneul, how did you estimate \(fourth\sqrt{3}\)=\(\sqrt{2}\)?

Re: In the given figure, the area of the equilateral triangle is [#permalink]
13 Feb 2014, 08:35

Thanks Bunuel, that makes sense now, coupled with the fact that the question is asking for approximate value not exact value. Thanks!! _________________

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