What is the formula for determining the gross area of walls?

The gross area of walls is determined by calculating the total wall length and multiplying it by the height of the walls. This formula accounts for the entirety of the wall structure, providing a measurement of the surface area without considering any openings like doors or windows. By applying the total wall length times the height, you achieve a straightforward and consistent method to derive the gross area, which is particularly useful in construction and estimation contexts for planning and material requirements.

The other choices do not correctly represent the calculation of gross wall area. For instance, total wall length plus openings does not yield the area but instead combines different dimensions inappropriately. Similarly, total area minus openings focuses on net area, which is not the same as gross area. Finally, dividing total height by length does not provide a meaningful measure of area, as area is a product of two dimensions rather than a quotient.