A hexahedron (plural: hexahedra) is any polyhedron with six faces. A cube, for example, is a regular hexahedron with all its faces square, and three squares around each vertex.Click to see full answer. Thereof, why is a cube called a regular Hexahedron?A cube is also a hexahedron because it is a polyhedron with 6 (hexa- means 6) faces. Cubes make nice 6-sided dice, because they are regular in shape, and each face is the same size. (Because the atoms link up as corners of a cube.)Also Know, does a cube have equal sides? A cube has six faces which are all squares, so each face has four equal sides and all four interior angles are right angles. See Definition of a square. A cube has 12 edges. Because all faces are squares and congruent to each other, all 12 edges are the same length. Thereof, is a cube a polyhedron? In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex. The cube is the only regular hexahedron and is one of the five Platonic solids. The cube is the only convex polyhedron whose faces are all squares.How many edges does a Hexahedron have? twelve edges