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The formula for area, expressed as Area = Length x Width, applies specifically to rectangles and squares. Both of these shapes can be characterized by a pair of dimensions where 'Length' refers to one side and 'Width' refers to the adjacent side. This relationship is foundational in geometry, as it allows for straightforward calculations when determining the space contained within the boundaries of these shapes.

In the case of a rectangle, the area is determined by multiplying the length of one side by the length of the side perpendicular to it. For a square, since all sides are equal, the computation is similar but with both dimensions being the same, effectively simplifying it to Side x Side.

Other shapes, such as triangles, circles, and parallelograms, utilize different formulas that reflect their unique geometric properties. For example, a triangle's area is calculated using 1/2 x base x height, a circle requires the formula πr², and a parallelogram's area is found through base x height. Thus, the formula given is distinctively applicable to rectangles and squares, reinforcing the understanding of how area measurement varies with shape.