Find and interpret perimeter and circumference in numeric and contextual problems.
Use perimeter in a real-world situation
Problem
A rectangular garden is \(12~\text{feet}\) long and \(9~\text{feet}\) wide. How many feet of fencing are needed to go all the way around the garden?
Big Picture
What this problem is really about
Words such as fencing and “all the way around” signal a boundary-length problem. Model the rectangular garden with two copies of its length and two copies of its width, then add all four exposed sides while carrying feet. Multiplying length by width would measure the region being enclosed rather than the material needed along its edge.
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