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VP
Joined: 26 Apr 2004
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In the xy-plane, point (r, s) lies on a circle with center [#permalink]
 16 Aug 2004, 21:29
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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.
please explain, thank you
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Senior Manager
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is this r^2 + s^2?
If so I would Say A.
If not I would Say E.
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VP
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Yes, indeed , r^2 + s^2,
thank you
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CEO
Joined: 15 Aug 2003
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can anyone explain this to the author please?
thanks
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GMAT Club Legend
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If (r,s) lies on the circle, then if we are told the radius, we can find out r^2 + s^2 using pythagoras theorem
(1) If radius is 2, then r^2+s^2 = 4. So (1) is sufficient
(2) is not sufficient, as we do not have a radius to equate and no other information pertaining to v2 and -v2 is given
So (A) is the answer
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