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guest621
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Post subject: coordinate geo from PREP SOFTWARE  Posted: Sun Mar 16, 2008 2:44 pm |
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GMAT PREP CAT 2: (Data Sufficiency)
A certain circular area has its center at point P and radius 4, and points X and Y lie on the same plane as the circular area. Does point Y lie outside the circular area?
1. The distance between point P and point X is 4.5.
2. The distance between point X and Y is 9.
Correct answer C.
Can you please help clarify how it is C? I thought it could have been E.
I read it as follows. Point X is outside the circle since it is beyond the distance of the radius with center point P. This is insufficient. B is insufficient because it says nothing in relation to center point P. But I thought the answer could have been E because it doesn't say where X and Y are. It could be anywhere on the plane? I must not be interpreting this properly.
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StaceyKoprince
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Post subject: Posted: Mon Mar 17, 2008 4:26 pm |
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| ManhattanGMAT Staff |
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Posts: 6064
Location: San Francisco
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First, draw a coordinate plane so you can sketch this out.
You are correct that statements 1 and 2 cannot help us by themselves, so eliminate A, B, and D.
Now, try them together. Pick a point for P - whatever you want - and draw the circle. Place X 4.5 away from P (and, of course, this will be outside of the circle).
Now. Place Point Y 9 spaces away from X, again anywhere you want. Is it possible to put that point inside the circle?
It's not. So the answer to your question is a definitive yes, which is sufficient. And note that although we don't actually know where P, X or Y actually are, the info DOES give us information about where they are relative to each other. That's all we need.
_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
Last edited by StaceyKoprince on Wed Mar 19, 2008 11:18 am, edited 1 time in total.
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guest612
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Post subject: ok Posted: Mon Mar 17, 2008 7:07 pm |
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thanks! i think i was trying to make it fit in the circle. now i undertand why it's C!
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StaceyKoprince
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Post subject: Posted: Wed Mar 19, 2008 4:41 pm |
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| ManhattanGMAT Staff |
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Posts: 6064
Location: San Francisco
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you're welcome!
_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
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rohan
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Post subject: Re: coordinate geo from PREP SOFTWARE Posted: Fri Aug 19, 2011 12:10 pm |
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Hey Stacey,
I'm a little confused here.
I plotted P, the circle and X at 4.5 points to the right of P (which puts it outside the circle). Now because there are no dimensions of the plane mentioned can't Y be placed 9 points to the right of X and hence outside the circle?
Thanks
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varun_783
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Post subject: Re: coordinate geo from PREP SOFTWARE Posted: Fri Aug 19, 2011 12:31 pm |
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Posts: 263
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Hi Rohan,
You are saying the same thing as Stacey. The point is outside the circle, whether you draw it on the left side of X or right side.
Regards
Sunil
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rohan
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Post subject: Re: coordinate geo from PREP SOFTWARE Posted: Fri Aug 19, 2011 4:11 pm |
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yup, sorry I read it wrong.
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RonPurewal
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Post subject: Re: coordinate geo from PREP SOFTWARE Posted: Thu Aug 25, 2011 3:43 am |
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| ManhattanGMAT Staff |
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Posts: 7146
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