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2025年9月美国B卷 · 第 9 题

2025年9月美国B卷 · 原库模块 2 · Q9 原库参考解析

In the xy-plane, an equation of circle A is \( (x-3)^2+(y-9)^2=25 \) . Circle B has the same center as circle A but has a radius that is twice the radius of circle A. Which equation represents circle B?
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