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The area of a rectangle is calculated using the formula that involves its length and width. In this case, the formula specifically states that the area (A) is equal to the length (L) multiplied by the width (W). This relationship is fundamental in geometry, as it allows us to determine how much space is enclosed within the boundaries of a rectangle.

In this formula, the length represents one side of the rectangle, while the width represents the adjacent side perpendicular to it. By multiplying these two dimensions, you effectively count all the unit squares that fit within the rectangle, leading to the total area.

The other options presented do not accurately reflect the calculations needed for a rectangle’s area. For example, the option referring to the base (B) times height (H) is more applicable to triangles or parallelograms rather than rectangles. The term S^2 typically indicates the area of a square, not a rectangle. Furthermore, dividing by 2 in the last option suggests a calculation more suitable for triangles, since a triangle's area is half the base times height. Therefore, the correct formula for the area of a rectangle remains length multiplied by width.