This learning activity starts with students predicting the two-dimensional shapes resulting from slicing three-dimensional figures from a picture. Students can work individually, in pairs, or small groups. Next, they move on to creating a 3D model using clay or play-doh and creating cross sections to verify their predictions. The activity focuses on three figures, the cube, a rectangular prism, and a right rectangular pyramid. Slices are confined to parallel to the base, perpendicular to the