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# Which of the following lists the number of points at which a

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Manager
Joined: 19 Aug 2007
Posts: 202
Which of the following lists the number of points at which a [#permalink]

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15 Jun 2008, 19:24
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Which of the following lists the number of points at which a circle can intersect a triangle?

1) 2 and 6 only
2) 2,4 and 6 only
3) 1,2,3 and 6 only
4) 1,2,3,4 and 6 only
5) 1,2,3,4,5 and 6
CEO
Joined: 17 May 2007
Posts: 2950
Re: Triangle & Circle [#permalink]

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15 Jun 2008, 19:47
E - I got into a tangle with this one as well. You have to consider a point of the circle touching a vertex of a triangle as an intersection point.
Director
Joined: 14 Aug 2007
Posts: 727
Re: Triangle & Circle [#permalink]

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15 Jun 2008, 20:08
gmat blows wrote:
Which of the following lists the number of points at which a circle can intersect a triangle?

1) 2 and 6 only
2) 2,4 and 6 only
3) 1,2,3 and 6 only
4) 1,2,3,4 and 6 only
5) 1,2,3,4,5 and 6

I did not understand this question clealrly.

what is meant by "the number of points"? is there any diagram associated with this Q
Senior Manager
Joined: 26 Mar 2008
Posts: 319
Location: Washington DC
Re: Triangle & Circle [#permalink]

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15 Jun 2008, 20:16
I got B. Bsd thats not intersection, if circle touches the vortex of triangle thats touch not intersection.
CEO
Joined: 17 May 2007
Posts: 2950
Re: Triangle & Circle [#permalink]

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15 Jun 2008, 20:19
marshpa I saw this on gmatprep2 . The OA is E - nuff said .. I picked B originally.
Director
Joined: 14 Oct 2007
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Location: Oxford
Schools: Oxford'10
Re: Triangle & Circle [#permalink]

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15 Jun 2008, 22:52
Intersection of two lines, curves, etc is defined as when the x,y values of those two curves are equal. So a mere "touching" of two curves means they intersect
Director
Joined: 05 Jan 2008
Posts: 688
Re: Triangle & Circle [#permalink]

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15 Jun 2008, 23:04
whoa ! I picked A

so if an option is given 1,2,3,4,5,6,7,8,9,10.. it would the answer?
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Director
Joined: 14 Oct 2007
Posts: 753
Location: Oxford
Schools: Oxford'10
Re: Triangle & Circle [#permalink]

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15 Jun 2008, 23:10
2
KUDOS
prasannar wrote:
whoa ! I picked A

so if an option is given 1,2,3,4,5,6,7,8,9,10.. it would the answer?

nope 6 is the maximum
Attachments

intersect.jpg [ 3.8 KiB | Viewed 1250 times ]

CEO
Joined: 17 May 2007
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Re: Triangle & Circle [#permalink]

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15 Jun 2008, 23:22
buffdaddy = geometry god.
Manager
Joined: 14 Jun 2007
Posts: 168
Location: Vienna, Austria
Re: Triangle & Circle [#permalink]

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16 Jun 2008, 01:29
buffdaddy - cheers for the smart pic ... that´s what i was looking for!

+1
SVP
Joined: 30 Apr 2008
Posts: 1874
Location: Oklahoma City
Schools: Hard Knocks
Re: Triangle & Circle [#permalink]

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16 Jun 2008, 05:48
I hate it when a question is simple, like this one, but it's unclear what the authors actually mean! Do they want to test us on geometry or do they want to test whether we use the same words as the test authors?

When I read intersect, I thought it meant pass through the line, not merely share and X or Y value.

Once you think about it, it makes sense that touching can be intersecting, but that's certainly NOT what I thought at first. I know I would have gotten this question wrong.
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Manager
Joined: 19 Aug 2007
Posts: 202
Re: Triangle & Circle [#permalink]

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16 Jun 2008, 08:33
I cant agree more - I thought this was a trick question and chose B thinking I outsmarted GMAT...only to realize it still managed to make me feel like an idiot.

I've never seen the word 'intersection' used in this way in geometry before - this definition makes somewhat more sense when applied to venn diagrams..but not to geometry, at least in my opinion Oh well - we live and we learn

OA is E.

thanks.

jallenmorris wrote:
I hate it when a question is simple, like this one, but it's unclear what the authors actually mean! Do they want to test us on geometry or do they want to test whether we use the same words as the test authors?

When I read intersect, I thought it meant pass through the line, not merely share and X or Y value.

Once you think about it, it makes sense that touching can be intersecting, but that's certainly NOT what I thought at first. I know I would have gotten this question wrong.
Director
Joined: 14 Oct 2007
Posts: 753
Location: Oxford
Schools: Oxford'10
Re: Triangle & Circle [#permalink]

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16 Jun 2008, 11:55
hi all,
this from wikipedia

http://en.wikipedia.org/wiki/Line%E2%80 ... tersection

focus on the diagram and the first sentence
Re: Triangle & Circle   [#permalink] 16 Jun 2008, 11:55
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# Which of the following lists the number of points at which a

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