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

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

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New post 11 Dec 2008, 17:42
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 (√2, -√2) lies on the circle.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

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Re: x y plane  [#permalink]

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New post 11 Dec 2008, 17:53
I think there is a typo in the question

Equation of a circle is (x-a)^2 + (y-b)^2 = r^2, where (a,b) is the center and r is the radius

since(a,b) = (0,0)

r^2 + s^2 = (radius)^2

Ans is D

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Re: x y plane &nbs [#permalink] 11 Dec 2008, 17:53
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In the xy-plane, point (r, s) lies on a circle with center

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