Not all groups of eubacteria have peptidoglycan, so all eubacteria may be classified as either Gram-positive (able to bind Gram's stain) or Gram-negative (unable to bind Gram's stain).
A portable DVD player is in the shape of a rectangular prism. A soccer ball is in the shape of a truncated icosahedron. These shapes are all examples of polyhedra. A three-dimensional shape whose faces are polygons is known as a polyhedron. This term comes from the Greek words poly, which means many, and hedron, which means face.. So, quite literally, a polyhedron is a three-dimensional object with many faces.
In geometry, a dodecahedron (Greek Î´ÏÎ´ÎµÎºÎ¬ÎµÎ´ÏÎ¿Î½, from Î´ÏÎ´ÎµÎºÎ± dÅdeka twelve + á¼Î´ÏÎ± hedra hÃ©dra, base seat or) face is any polyhedron with twelve flat. Faces the most familiar dodecahedron is the regular, dodecahedron which is A platonic. solid