Find and interpret perimeter and circumference in numeric and contextual problems.
Decide which boundary measure to use
Problem
A park has a round fountain. The groundskeeper wants to measure the distance all the way around the edge of the fountain. Should this be measured with perimeter or circumference?
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What this problem is really about
Translate the context into both a shape and a type of measurement. The fountain is circular, and “all the way around the edge” asks for its boundary length, not the region inside or a straight distance across. Use the circle-specific name for that boundary measure before doing any calculation.
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