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ZX-D8108B4AFEBluebook试题11 · 第 7 题
Bluebook试题11 · 原库模块 3 · Q7 原库参考解析
Circle A in the xy-plane has the equation \( (x+5)^2+(y-5)^2=25 \). Circle B has the same center as circle A. The radius of circle B is two times the radius of circle A. The equation defining circle B in the xy-plane is \( (x+5)^2+(y-5)^2=k \), where k is a constant. What is the value of k?
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