I * * have eight columns of first-year math robots. Stereograph, visible edges are drawn with solid lines, and invisible edges are drawn with dotted lines. A three-dimensional figure surrounded by six identical squares is called a cube. A straight parallelepiped with square sides and bottom is called a cube, that is, a hexahedron with equal sides, also called a cubic hexahedron. A cube is a regular polyhedron composed of six square faces, so it is also called a regular hexahedron. It has 12 edges and 8 vertices. Cube is a special kind of cuboid. It has 12 sides (edges) and 8 tops (points), and is one of the five Platonic solids.