What is the capacity formula for four-sided objects?

The capacity formula for four-sided objects, such as rectangular prisms, is correctly represented in the first option as length multiplied by width multiplied by height, which is expressed as L x W x H. This formula calculates the volume in cubic feet.

Once the volume in cubic feet is obtained, it is converted into gallons by multiplying by 7.48, which is the number of gallons in one cubic foot. This conversion is crucial for applications that require measuring liquid capacity in gallons, such as in on-site sewage facilities, where understanding the volume of liquids is important for system design and management.

The other options don't correctly apply the formula for calculating volume. For instance, adding the dimensions (length, width, and height) does not yield a volume measurement. Furthermore, dividing or performing operations other than multiplication for the volume calculation does not conform to the mathematical principles that govern three-dimensional geometry. Thus, the correct approach is multiplication of the dimensions, followed by conversion to gallons using the appropriate factor.