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DS. CIRCLE

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by [email protected] » Tue Sep 13, 2011 9:38 am
Q: DOES A CIRCLE INTERSECT WITH AXIS X ?

A: THE DISTANCE BETWEEN THE CENTER OF THE CIRCLE AND AXIS X IS GREATER THAN THAT BETWEEN CENTER OF THE CIRCLE AND AXIS Y ?

B: THE CIRCLE INTERSECT AXIS Y
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by 1947 » Tue Sep 13, 2011 9:45 am
Ans A as it is suff to tell that circle does not intersect X axis.
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by gmatboost » Thu Sep 15, 2011 7:50 am
That is incorrect.

The center could be at (3, 4) with a radius of 5.

Note that DISTANCE BETWEEN THE CENTER OF THE CIRCLE AND AXIS X = |y|
THAT BETWEEN CENTER OF THE CIRCLE AND AXIS Y = |x|

St 1 just tells us that if the center is (x, y), then |y| > |x|. Nothing about the radius of the circle.

St 2 says that r > |x|. No info about |y|.

Together r > |x| > |y|, so r > |y| which means it does intersect the x-axis. C.
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by thestartupguy » Thu Sep 15, 2011 11:53 am
IMO : E

what's the OA?
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by mehrasa » Thu Sep 15, 2011 2:13 pm
gmatboost wrote:That is incorrect.

The center could be at (3, 4) with a radius of 5.

Note that DISTANCE BETWEEN THE CENTER OF THE CIRCLE AND AXIS X = |y|
THAT BETWEEN CENTER OF THE CIRCLE AND AXIS Y = |x|

St 1 just tells us that if the center is (x, y), then |y| > |x|. Nothing about the radius of the circle.

St 2 says that r > |x|. No info about |y|.

Together r > |x| > |y|, so r > |y| which means it does intersect the x-axis. C.
hey Greg

when we consider two statements
r> [x] and [y]>[x] but we can not determine what is the relationship between r and [y]
i am not sure why you concluded that r>[x]>[y]???????????
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by 1947 » Fri Sep 16, 2011 9:48 am
mehrasa wrote:
gmatboost wrote:That is incorrect.

The center could be at (3, 4) with a radius of 5.

Note that DISTANCE BETWEEN THE CENTER OF THE CIRCLE AND AXIS X = |y|
THAT BETWEEN CENTER OF THE CIRCLE AND AXIS Y = |x|

St 1 just tells us that if the center is (x, y), then |y| > |x|. Nothing about the radius of the circle.

St 2 says that r > |x|. No info about |y|.

Together r > |x| > |y|, so r > |y| which means it does intersect the x-axis. C.
hey Greg

when we consider two statements
r> [x] and [y]>[x] but we can not determine what is the relationship between r and [y]
i am not sure why you concluded that r>[x]>[y]???????????
yes thats correect Ans should be E we dont have any relation that says r>|y|
If my post helped you- let me know by pushing the thanks button. Thanks
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by gmatboost » Fri Sep 16, 2011 10:06 am
Yup, you are both absolutely right, you definitely can't conclude that r > |x| > |y|.

I mis-read my own conclusion from statement 2. Sorry about that.
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