Complete a missing step in a circle-similarity proof
Problem
Complete this proof step about circle similarity: Circle \(A\) has radius \(4\) and circle \(B\) has radius \(12\). After aligning centers, dilate by .
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What this problem is really about
A circle-similarity proof separates position from size: first align the centers, then scale every radius from that shared point. We’ll form the target-to-source radius ratio and verify that the resulting dilation sends the source radius exactly to the target radius.
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