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D01-35

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Re: D01-35 [#permalink]

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New post 25 Nov 2016, 06:24
This is like one of those tricky GMAT questions. I love it. Well done Bunuel
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Re: D01-35 [#permalink]

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New post 20 Dec 2016, 09:13
Hello,

Why do we have to assume it is a circle, not a square or rectangle?
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Re: D01-35 [#permalink]

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New post 08 Jan 2017, 04:09
Not a geometry fan but the logic of choosing circle COULD BE that when we take all the shapes with approximately same area, circle would be enclosed easily as it is round without any edges.

I don't know how much this makes sense but this is what I think might be the reason.
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Re: D01-35 [#permalink]

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New post 21 Jan 2017, 06:16
The question states that there is an area of 154 square meters and asks you to determine the minimum possible perimeter for this figure.
There is no statement whether the figure is a triangle, quadriliteral or circle.
You need to know the a circle is the figure, which has the biggest area for a given perimeter or if you have a given area the figure with the smallest perimeter is a circle.
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Re: D01-35 [#permalink]

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New post 06 May 2017, 22:17
If circle has the minimum area than which geometry figure has the maximum area?
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D01-35 [#permalink]

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New post 29 May 2017, 00:43
Hi Bunuel

A circle is the shape with the largest area for a given length of perimeter (has the highest area to length ratio when compared to other geometric figures such as triangles or rectangles).

Does this mean that the circle has minimum perimeter for a given area as compared to equilateral triangles or square/rectangles.

so can i write

A/P of Circle > A/P of other geometric figures

Also if we can classify other geometric figures in order

Please correct me if i am thinking too much
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Re D01-35 [#permalink]

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New post 28 Oct 2017, 02:15
I think this is a poor-quality question and the explanation isn't clear enough, please elaborate. The question even did not mention the shape !! how can you approach
GMAT CLUB should imediately correct the questions and make it state clearly that the shape is circle
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Re: D01-35 [#permalink]

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New post 28 Oct 2017, 02:18
zx33788115 wrote:
I think this is a poor-quality question and the explanation isn't clear enough, please elaborate. The question even did not mention the shape !! how can you approach
GMAT CLUB should imediately correct the questions and make it state clearly that the shape is circle


The question is 100% correct.

The figure which has the minimum possible perimeter for a given area is a circle. This is a known mathematical property. Since a circle has the minimum possible perimeter for a given area, then in order to minimize the length of a rope it should enclose a circle.
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Re: D01-35 [#permalink]

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New post 29 Oct 2017, 03:42
Bunuel wrote:
zx33788115 wrote:
I think this is a poor-quality question and the explanation isn't clear enough, please elaborate. The question even did not mention the shape !! how can you approach
GMAT CLUB should imediately correct the questions and make it state clearly that the shape is circle


The question is 100% correct.

The figure which has the minimum possible perimeter for a given area is a circle. This is a known mathematical property. Since a circle has the minimum possible perimeter for a given area, then in order to minimize the length of a rope it should enclose a circle.



Dear Bunuel,

I would like if there is a property for maximum perimeter for a given area?
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Re: D01-35 [#permalink]

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New post 03 Dec 2017, 16:41
Bunuel niks18 chetan2u


Quote:
The figure which has the minimum possible perimeter for a given area is a circle. This is a known mathematical property. Since a circle has the minimum possible perimeter for a given area, then in order to minimize the length of a rope it should enclose a circle.


Can you please explain reasoning behind this? Is you line of thought based on squares of radii or sides?
Why did we not consider a square / rectangle?
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Re: D01-35 [#permalink]

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New post 07 Feb 2018, 00:34
hello Bunuel

One quick question as there seems to be contradictory information:

For a given area, which figure has the less possible perimeter?
As per the question above, it's circle.
However, as per your own post on all information on triangles, it's equilateral triangle.
I cant add the link to your own post here as I'm a new member and there seems to be some restriction with posting links.

Please explain. If both are applicable in different scenarios, then do share these scenarios.

Thanks.
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Re: D01-35 [#permalink]

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New post 07 Feb 2018, 00:52
sanjay1810 wrote:
hello Bunuel

One quick question as there seems to be contradictory information:

For a given area, which figure has the less possible perimeter?
As per the question above, it's circle.
However, as per your own post on all information on triangles, it's equilateral triangle.
I cant add the link to your own post here as I'm a new member and there seems to be some restriction with posting links.

Please explain. If both are applicable in different scenarios, then do share these scenarios.

Thanks.


For triangles it's equilateral triangle but for any shape it's circle.
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New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
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Re: D01-35   [#permalink] 07 Feb 2018, 00:52

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