Use area formulas for rectangles, triangles, parallelograms, trapezoids, and composite figures.
Use area for covering problems
Problem
A rectangular bedroom floor is \(12~\text{feet}\) long and \(15~\text{feet}\) wide. How many square feet of carpet are needed to cover the floor?
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What this problem is really about
Carpet covers the whole floor surface, so the relevant measure is area rather than the distance around the room. Model the floor as a rectangle and multiply its length by its width, carrying the units through the product. Feet times feet becomes square feet, matching the two-dimensional material being requested.
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