Find and interpret perimeter and circumference in numeric and contextual problems.
Add the side lengths for perimeter
Problem
A rectangle has side lengths \(8~\text{cm}\) and \(5~\text{cm}\). What is its perimeter?
Big Picture
What this problem is really about
Perimeter measures one complete trip around the outside, so every boundary segment must be counted exactly once. A rectangle has two sides of each given dimension; add those four lengths or double the sum of one length and one width. Keeping the result in linear units distinguishes this boundary measure from area.
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