The surface area of a rectangular swimming pool that is 50 feet wide and 100 feet long is:

To determine the surface area of a rectangular swimming pool, you multiply its length by its width. In this scenario, the pool is 50 feet wide and 100 feet long.

Calculating the surface area involves the following steps:

1. Length = 100 feet

2. Width = 50 feet

3. Surface Area = Length × Width = 100 feet × 50 feet = 5000 square feet.

The reason that the calculated surface area of 5000 square feet is the correct answer is that it accurately reflects the total area that the pool occupies on the ground. This measurement is essential for various operational considerations, such as water volume calculations, maintenance needs, and overall design planning for the space.