- SA: Rectangles
- SA: Cylinders
- Volume: Rectangles
- Volume: Cylinders

The volume of a three-dimensional figure is the amount of space within it. That is, the volume of a polyhedron is equal to the number of unit cubes that can fit inside it. Sometimes determining the number of cubes that will fit is easy, and sometimes it's rather difficult. Let's look at one of the easy situations first.

**Volume of a Rectangles**

Enter your calculation in the box. Upon hitting the enter key, if your calculation is wrong, your answer will appear in red and you will be given two hints.

Next: **Volume: Cylinders**