Find and interpret perimeter and circumference in numeric and contextual problems.
Use circumference in a real-world situation
Problem
A circular gift box has a diameter of \(12~\text{inches}\). Calculate the exact length of ribbon needed to wrap once around the box.
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What this problem is really about
A single wrap of ribbon follows the circular boundary, so the needed length is a circumference. Identify the supplied measure as a diameter and use the diameter form of the formula directly, keeping pi symbolic because an exact length is requested. Treating the diameter as a radius would introduce an extra factor of two.
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