This math topic focuses on identifying cross sections of various 3D shapes. Students are presented with images of 3D shapes and asked to determine what 2D shape would result from slicing the 3D shape in a particular way. Specific cross sections they work with include trapezoids, ovals, rectangles, circles, and triangles. This fundamental geometric concept is crucial for visualizing and understanding the spatial relationship between different dimensions. The activity is designed to enhance students' skills in classifying shapes and understanding complex geometric properties.