Class+Version+2

  Great Job  =**Classification:** =

1. The //Cuboid//, also called a //rectangular parallelepiped,// is a parallelepiped in which all sides are rectangles and perpendicular to each other. 2. The //Cube// is a cuboid in which all sides are square. 3. The //Rhombohedron// is a parallelepiped in which all sides are rhombus.

=**Parallelepiped vs. tetrahedron:**=

1. **Comparison ****: **  The Parallelepiped and the Tetrahedron are polyhedrons.   The Tetrahedron has four triangular faces, three less that the Parallelepiped and the faces of a tetrahedron are triangles. Also the Tetrahedron has less edge (6) and less vertexes (4). The tetrahedron is, in number, half of faces, edges and vertexes which have a Parallelepiped.
 * <span style="font-size: 14pt; line-height: 115%; font-family: 'Cambria Math','serif';">2.<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"> ****<span style="font-size: 14pt; line-height: 115%; font-family: 'Cambria Math','serif';">Contrast ****<span style="font-size: 14pt; line-height: 115%; font-family: 'Cambria Math','serif';">: **<span style="font-size: 14pt; line-height: 115%; font-family: 'Cambria Math','serif';">