Slicing Three-Dimensional Figures and Identifying the Resulting Cross-Sections

Prior to completing this activity, ensure the students have an understanding of the difference between vertical and horizontal slicing of three-dimensional figures. Students also need to understand when a slice is made through a three-dimensional figure, the result is a two-dimensional figure called a cross-section. One effective way to illustrate these concepts is through the use of play-dough three-dimensional models. Demonstrate both horizontal and vertical slices with string so the students visually see the resulting two-dimensional cross-sections. Have students turn and talk about the resulting cross-section and then share their observations with the class.

Pass out the graphic organizer for students to complete using the Interactivate Cross Section Flyer digital tool. Students can complete the activity in groups of 3-4 or independently.