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."Continue Reading
If this information is not given, measure the sides or refer to the provided graph.
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.
Since area is a surface measurement, it must be expressed in square units. In this example, the final measurement is 48 square inches.