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MBA.com questions on perimeter of a Triangle

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shantascherla
 Post subject: MBA.com questions on perimeter of a Triangle
 Post Posted: Thu Mar 10, 2011 10:11 pm 
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Course Students


Posts: 21
If a triangle has two sides 2 & 5. what could be the perimeter

1 9
2 15
3 19

Solution is none

How does one approach when such questions when the triangle type is not defined at all..?
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jnelson0612
 Post subject: Re: MBA.com questions on perimeter of a Triangle
 Post Posted: Fri Mar 11, 2011 7:38 am 
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ManhattanGMAT Staff


Posts: 1857
Hi shanta,
Is this question from the GMAT prep test provided to you by mba.com?

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Jamie Nelson
ManhattanGMAT Instructor
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shantascherla
 Post subject: Re: MBA.com questions on perimeter of a Triangle
 Post Posted: Fri Mar 11, 2011 9:45 pm 
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Course Students


Posts: 21
Yes jamie it is part of the first test
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tim
 Post subject: Re: MBA.com questions on perimeter of a Triangle
 Post Posted: Tue Mar 15, 2011 4:17 pm 
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ManhattanGMAT Staff


Posts: 2242
Location: Southwest Airlines, seat 21C
this is a triangle inequality problem. what you want to do is take the potential perimeters and use each to figure out what the third side is. once you know all three sides, you can only form a valid triangle if the two shorter sides add up to more than the third side. you don't need to know anything else about what the triangle is supposed to look like..

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Tim Sanders
Manhattan GMAT Instructor
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sthitaprajnadas
 Post subject: Re: MBA.com questions on perimeter of a Triangle
 Post Posted: Tue Apr 19, 2011 10:33 am 
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Students


Posts: 1
As per triangle inequality theorem sum of length any two sides of a triangle should always be more than the length of the third side and dfifference between the lenghts of two sides should always be less than the third side.

going by this: Here the length of third side 3< L3 <7
hence perimeter 3+7 < P < 7+7 lies between 10 and 14 hence none fits the bill.

Sthita
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tim
 Post subject: Re: MBA.com questions on perimeter of a Triangle
 Post Posted: Tue Apr 19, 2011 11:07 pm 
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ManhattanGMAT Staff


Posts: 2242
Location: Southwest Airlines, seat 21C
exactly..

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Tim Sanders
Manhattan GMAT Instructor
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