The units used for the cross-sectional areas in the footing calculation are:

The units used for the cross-sectional areas in the footing calculation are:

• A. Inches
• B. Feet
• C. Meters
• D. Yards

Answer: (A)

Cross-sectional area comes from multiplying two linear dimensions, so its units are the square of the length unit you use. In footing calculations, those dimensions are typically given in inches, so the area is expressed in square inches (in^2). Using feet would yield square feet, which is less convenient for the small-scale dimensions common in footings, and meters or yards aren’t used in this US customary context unless you’re working in metric units. For example, if a footing is 12 inches wide and 9 inches thick, the cross-sectional area is 108 square inches.

Cross-sectional area comes from multiplying two linear dimensions, so its units are the square of the length unit you use. In footing calculations, those dimensions are typically given in inches, so the area is expressed in square inches (in^2). Using feet would yield square feet, which is less convenient for the small-scale dimensions common in footings, and meters or yards aren’t used in this US customary context unless you’re working in metric units. For example, if a footing is 12 inches wide and 9 inches thick, the cross-sectional area is 108 square inches.