13.1 3-D Objects made with cubes

13.2 Representation of 3-D figures on 2-D

13.3 Various Geometrical Solids

13.4 Faces, Edges and Vertices of 3D-Objects

13.5 Regular Polyhedron

13.5.1 Prism and Pyramid

13.6 Number of Edges , Faces and Vertices of polyhedrons

13.7 Net Diagrams