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# In the xy-plane, point (r, s) lies on a circle with center

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Director
Joined: 03 Nov 2004
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In the xy-plane, point (r, s) lies on a circle with center [#permalink]

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01 Jul 2005, 06:40
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In the xy-plane, point (r, s) lies on a circle with center at the origin. What is the value of
r2 + s2?
(1) The circle has radius 2.
(2) The point (v2, -v2) lies on the circle.

SVP
Joined: 05 Apr 2005
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01 Jul 2005, 07:02
A. the value of r^2 +s^2= (redius)^2=4
statement 2 is irrelavant.
Director
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01 Jul 2005, 18:44
HIMALAYA wrote:
A. the value of r^2 +s^2= (redius)^2=4
statement 2 is irrelavant.

This will be possible only if the point lies on the x-axis or the y-axis right, doesn't the question read that the point can be anywhere on the circle?
SVP
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01 Jul 2005, 21:16
HIMALAYA wrote:
A. the value of r^2 +s^2= (redius)^2=4
statement 2 is irrelavant.

This will be possible only if the point lies on the x-axis or the y-axis right, doesn't the question read that the point can be anywhere on the circle?

no, if a point (r, s) lies on the circle, it means the point is on the perieter/circumference of the circle....
Director
Joined: 03 Nov 2004
Posts: 858
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02 Jul 2005, 05:50
HIMALAYA wrote:
no, if a point (r, s) lies on the circle, it means the point is on the perieter/circumference of the circle....

Thanks HIMALAYA, I was misinterpreted the question and I was thinking that we need to find r,s
Re: DS1   [#permalink] 02 Jul 2005, 05:50
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