The lateral area of a solid is the area of all the lateral faces. Which statement is true about lateral area?

• A. The area of all the lateral faces.
• B. The area of the base faces.
• C. The total surface area including bases.
• D. The interior surface area.

Answer: (B)

Lateral area is the portion of the surface that runs around the sides of the solid, not the bases. Imagine wrapping a label around the outside of the figure—the side faces (rectangular sides for a prism, the curved surface for a cylinder). Those side faces together give the lateral area, and they do not include the top and bottom bases.

Because it excludes the bases, the area of just the base faces is not lateral area. The total surface area would combine the lateral area with the areas of the bases. Interior surface area refers to surfaces on the inside, which isn’t what lateral area measures.

So, the true description is: the area of all the lateral faces.