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ZX-EC2C28441ECircles · 第 6 题
Circles · 原库模块 1 · Q6 原库参考解析
Circle A in the xy-plane has the equation (x + 5)2 + (y - 5)2 = 4. 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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