How do you calculate the surface area of a circular pool?

To calculate the surface area of a circular pool, the formula used is based on the radius of the circle. The formula for the area of a circle is:

Area = π * r²

In this context, π (pi) is approximately 3.14, and 'r' represents the radius of the circle, which is half of the diameter.

The correct choice uses the formula by first calculating the radius (which is the diameter divided by 2) and then squaring that radius. Thus, it takes the diameter, divides it by 2 to find the radius, and then applies the area formula by multiplying by π (3.14) and the squared radius. This results in the accurate calculation of the surface area of a circular pool.

This reasoning clarifies how the other choices do not provide the correct computation. For instance, some options attempt to use the diameter directly rather than converting it to the radius, while others misapply the formulas entirely, leading to inaccurate results.