What is the formula for the volume of a rectangular solid?

• A. Length x Height
• B. Width x Height
• C. Volume = Height x Width
• D. Length x Width x Height

Answer: (D)

Volume for a rectangular solid is found by multiplying its three dimensions—the length, width, and height. So the volume equals Length × Width × Height. The order of multiplication doesn’t matter, but you need all three measurements to get the total space inside.

The other options only use two dimensions, which gives the area of a face (for example, length × height or width × height). Those products aren’t the total space inside the solid, which is why they’re not correct.