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.牥_出国考试答疑器_GMAT

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.

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请问由问题怎么看出来时问半径的平方？是因为 r 吗? 条件二怎么判断?

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