Area and volume share what type of measurement distinction?

• A. Area uses square units, volume uses cubic units
• B. Area uses cubic units, volume uses square units
• C. Both use square units
• D. Area uses linear units only

Answer: (A)

Area is a two‑dimensional measure of surface, so its units are square units. Volume is a three‑dimensional measure of space, so its units are cubic units. This distinction shows up in practice: a 5 ft by 3 ft rectangle has an area of 15 square feet, while a 5 ft by 3 ft by 2 ft box has a volume of 30 cubic feet. The square units come from multiplying two lengths (length × width), and the cubic units come from multiplying three lengths (length × width × height). The other options either swap the unit types or claim area uses linear units only, which isn’t correct.