Question

4. In a 2-dimensional object we had 2 measures: perimeter, distance around the object, and area, the amount of space inside an object. In a 3-dimensional object we have 2 measures as well. The area on the outside of the object called and the space inside the object called

Answer 1

The area on the outside of a 3-dimensional object is the area of its surface.

Hence, this area is called

(total) surface area

The space inside a 3-dimensional object is called

volume