The area of a rectangle is calculated from its width and height. Since a square is also a rectangle, the area of such polygons is also determined using the formula "area = width x height."
- Find the height and width of the rectangle
If this information is not given, measure the sides or refer to the provided graph.
- Plug the numbers into the formula
The product of the length and the width is the area of the rectangle. For example, a rectangle that is 6 inches long and 8 inches wide has an area of 48.
- Express the area in square units
Since area is a surface measurement, it must be expressed in square units. In this example, the final measurement is 48 square inches.