Learning goals: Teacher Facing Categorize images of planes intersecting pyramids and prisms, and describe (orally) the categories. Comprehend that the term “cross section” (in spoken and written language) refers to the two-dimensional face that results from slicing a three-dimensional figure. Describe, compare, and contrast (orally and in writing) different cross sections that could result from slicing the same pyramid or prism. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.7 Angles, Triangles, and Prisms, Grade 7.