Use area formulas for rectangles, triangles, parallelograms, trapezoids, and composite figures.
Multiply length by width
Problem
A rectangle has a length of \(9~\text{cm}\) and a width of \(4~\text{cm}\). What is its area?
Big Picture
What this problem is really about
Area counts how many unit squares cover the rectangle, which organizes naturally as rows by columns. Multiply the two perpendicular dimensions so both the length and width contribute to the covered surface. Because centimeters are multiplied by centimeters, the result must be labeled in square centimeters rather than a linear unit.
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