Find and interpret perimeter and circumference in numeric and contextual problems.
Decide what the context is asking you to measure
Problem
Workers need the length of rope required to go once around the edge of a circular pond. Name the measure they need.
Big Picture
What this problem is really about
First classify what the situation measures: around a boundary, across a shape, or over the region inside. Here the rope traces one complete outside edge, so the needed quantity is a boundary length; then let the circular shape determine the precise name for that measure. This two-step reading separates the path being measured from the shape that names it.
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