What is the formula for calculating the surface area of a rectangular pool?

The formula for calculating the surface area of a rectangular pool is derived from the basic geometric definition of area. For a rectangle, the area is found by multiplying the length by the width. This relationship applies directly to pools, where these dimensions represent the pool's horizontal surface extent.

When you multiply the length by the width, you get the total surface area, which is essential for various calculations related to pool maintenance, including determining the amount of water needed to fill the pool and the necessary chemicals for water treatment. This formula is foundational in pool management and maintenance practices.

In contrast, the other options do not accurately represent the method for calculating the surface area of a rectangle. The sum of length and width, division of length by width, or the expression involving both length and width multiplied by two, do not yield the correct surface area measurement for a pool and reflect different mathematical concepts that do not apply in this context.