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If two sides of a triangle have length 2 and 5, which of the

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If two sides of a triangle have length 2 and 5, which of the [#permalink] New post 10 Aug 2007, 18:00
If two sides of a triangle have length 2 and 5, which of the folowing could be the perimeter of the triangle?

I 9
II 15
III 19

thanks
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 [#permalink] New post 10 Aug 2007, 18:22
is None an option?

With triangles, the rule is that the 3rd side must be greater than the difference of side 1 and side 2 but less than their sum.

Since side one is =2, side two is =5, difference is 3, sum is 7.

smallest perimeter: 2+5+4 = 11
largest perimeter: 2+5+6 = 13.

doesn't fall into any of the choices, so I would have picked None of the Above.
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 [#permalink] New post 10 Aug 2007, 22:27
yup, none of those work at all. I hope that was a choice.

Just try to visualize it if you don't like the math.

You can't have one side be 5 and have the other two sides be 2 and 2 because they would never close to make a triangle.

8 is too much because that's more than 5+2 so 15 is out. which makes 19 even more ridiculous. if the other 2 sides laid end to end are shorter than the 3rd side there's no way it can work.
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 [#permalink] New post 11 Aug 2007, 02:14
misterJJ2u wrote:
is None an option?

With triangles, the rule is that the 3rd side must be greater than the difference of side 1 and side 2 but less than their sum.

Since side one is =2, side two is =5, difference is 3, sum is 7.

smallest perimeter: 2+5+4 = 11
largest perimeter: 2+5+6 = 13.

doesn't fall into any of the choices, so I would have picked None of the Above.


it is none actually,
i just could not remember the rule thanks mate

but i like math eschn3am
  [#permalink] 11 Aug 2007, 02:14
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