Learning goals: Teacher Facing Compare and contrast (orally) triangular prisms, including comparisons of their height, cross sections, surface area, and volume. Compose two triangular prisms into a new prism, and describe (orally and in writing) the composite shape. Draw and assemble a net of a triangular prism, given two side lengths of the prism’s base and one angle measure. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.7 Angles, Triangles, and Prisms, Grade 7.