Use a circle similarity scale factor to compare circumferences
Problem
\(\text{Two}~\text{circles}\) are similar. Using the scale-factor information \(3\), how do their circumferences compare?
Big Picture
What this problem is really about
Circumference is a linear measure, so it scales like radius rather than area. We’ll substitute a scaled radius into the circumference formula, factor out the length scale, and preserve the requested target-to-source order in the comparison.
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