How can we construct radical axis of 2 circles where one is inside the other one?

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How can we construct radical axis of 2 circles where one is inside the other one? For example in this case.

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On this web site http://mathafou.free.fr/pbg/sol139.html they construct one but it's not explained.

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Just draw a circle which cuts both. Then draw radical axsis and their intersection is radical center $R$. Then the line perpendicular to line across centers through $R$ is their radical line. enter image description here