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Math·Geometry and Trigonometry·Circles

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Circle A in the xy-plane has the equation $(x+8{)}^2+(y-8{)}^2=25$. 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 $(x+8{)}^2+(y-8{)}^2=k$, where $k$ is a constant. What is the value of $k$?

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