The document discusses different types of three-dimensional geometric shapes. It describes regular polyhedrons including the tetrahedron, cube, octahedron, dodecahedron, and icosahedron. It also discusses prisms, pyramids, cylinders, cones, and spheres. It notes the dual relationships between some polyhedrons. Finally, it provides formulas for calculating the areas and volumes of cubes, prisms, pyramids, spheres, cylinders, and cones.