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Is the perimeter of equilateral triangle T greater than the perimeter

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Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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Is the perimeter of equilateral triangle T greater than the perimeter of square S?

(1) The ratio of the area of T to the area of S is \(\sqrt{3} : 1\).
(2) The ratio of the length of a side of T to a side of S is 2 : 1.
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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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rxs0005 wrote:
Is the perimeter of the equilateral triangle T greater than the perimeter of the square S

The ratio of the area of T to area of S is root (3) : 1

The ratio of length of a side of T to a side of T is 2 : 1


\(P_{equilateral}=3t\) and \(P_{square}=4s\), where \(t\) and \(s\) are the sides of triangle and square respectively. Question: is \(P_{equilateral}>P_{square}\). You can notice that if we knew the ratio of the side \(t\) to the side \(s\) then we would be able to answer the question.

(1) The ratio of the area of T to area of S is root (3) : 1 --> both the area of the equilateral triangle (\(area_{equilateral}=t^2\frac{\sqrt{3}}{4}\)) and the area of a square (\(area_{square}=s^2\)) can be expressed with their sides, so we could get the ratio of the sides from the ratio of the areas. Sufficient.

(2) The ratio of length of a side of T to a side of S is 2 : 1 --> directly gives us the ratio of the sides. Sufficient.

Answer: D.
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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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New post 06 Oct 2010, 07:13
D it is :)

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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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Hello from the GMAT Club BumpBot!

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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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New post 14 Mar 2017, 16:15
Can someone give another example of the first statement? I am still unclear about it.

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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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New post 14 Mar 2017, 16:20
Bunuel wrote:
rxs0005 wrote:
Is the perimeter of the equilateral triangle T greater than the perimeter of the square S

The ratio of the area of T to area of S is root (3) : 1

The ratio of length of a side of T to a side of T is 2 : 1


\(P_{equilateral}=3t\) and \(P_{square}=4s\), where \(t\) and \(s\) are the sides of triangle and square respectively. Question: is \(P_{equilateral}>P_{square}\). You can notice that if we knew the ratio of the side \(t\) to the side \(s\) then we would be able to answer the question.

(1) The ratio of the area of T to area of S is root (3) : 1 --> both the area of the equilateral triangle (\(area_{equilateral}=t^2\frac{\sqrt{3}}{4}\)) and the area of a square (\(area_{square}=s^2\)) can be expressed with their sides, so we could get the ratio of the sides from the ratio of the areas. Sufficient.

(2) The ratio of length of a side of T to a side of S is 2 : 1 --> directly gives us the ratio of the sides. Sufficient.

Answer: D.


What I'm unclear about is the formula t squared=root 3 divided by four. Does that formula give the ratio of the sides? Like if the sides of an equilateral were 2 : 2 : 2 then would 2^2 times root divided by four equal the ratio of the side of a square- does that mean the side of a square is 2 root 3 then? Two squared= 4 times root 3 divided by four then cancels out to root 3 then multiply 2 by root 3 and that's the length of the side of the square?

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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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New post 14 Mar 2017, 20:35
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Nunuboy1994 wrote:
Bunuel wrote:
rxs0005 wrote:
Is the perimeter of the equilateral triangle T greater than the perimeter of the square S

The ratio of the area of T to area of S is root (3) : 1

The ratio of length of a side of T to a side of T is 2 : 1


\(P_{equilateral}=3t\) and \(P_{square}=4s\), where \(t\) and \(s\) are the sides of triangle and square respectively. Question: is \(P_{equilateral}>P_{square}\). You can notice that if we knew the ratio of the side \(t\) to the side \(s\) then we would be able to answer the question.

(1) The ratio of the area of T to area of S is root (3) : 1 --> both the area of the equilateral triangle (\(area_{equilateral}=t^2\frac{\sqrt{3}}{4}\)) and the area of a square (\(area_{square}=s^2\)) can be expressed with their sides, so we could get the ratio of the sides from the ratio of the areas. Sufficient.

(2) The ratio of length of a side of T to a side of S is 2 : 1 --> directly gives us the ratio of the sides. Sufficient.

Answer: D.


What I'm unclear about is the formula t squared=root 3 divided by four. Does that formula give the ratio of the sides? Like if the sides of an equilateral were 2 : 2 : 2 then would 2^2 times root divided by four equal the ratio of the side of a square- does that mean the side of a square is 2 root 3 then? Two squared= 4 times root 3 divided by four then cancels out to root 3 then multiply 2 by root 3 and that's the length of the side of the square?


First of all please use math formulas (check here: https://gmatclub.com/forum/rules-for-po ... l#p1096628).

Next, \(t^2*\frac{\sqrt{3}}{4}\) is a formula for an area of an equilateral triangle with the length of a side equal to t.
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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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New post 14 Mar 2017, 20:47
We can find the sides of triangle and square using a and b separately. Hence it is D.

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Re: Is the perimeter of equilateral triangle T greater than the perimeter [#permalink]

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New post 15 Mar 2017, 00:53
rxs0005 wrote:
Is the perimeter of equilateral triangle T greater than the perimeter of square S?

(1) The ratio of the area of T to the area of S is \(\sqrt{3} : 1\).
(2) The ratio of the length of a side of T to a side of S is 2 : 1.


Let the side for the triangle be t and square be s

St 1:\sqrt{3}/4 *t^2/s^2 = \sqrt{3}

or t/s = 2
or t = 2s

therefroe the perimeter for the triangle = 3t = 6s
area of suare = 4s
hence 6s>4s
ANSWER

St 2: t/s = 2 or t = 2s
therefroe the perimeter for the triangle = 3t = 6s
area of suare = 4s
hence 6s>4s
ANSWER

Option D

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Re: Is the perimeter of equilateral triangle T greater than the perimeter   [#permalink] 15 Mar 2017, 00:53
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