Set the length, width, and height and you'll generate a model of a cube or rectangular prism! This is good for middle school math where you learn basic geography, because it shows you the surface area and volume! Surface Area = L*W*2 + L*H*2 + H*W*2. Volume = L*W*H. If you still don't understand, there's a tutorial you can watch to learn about 3D shape calculating!