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EnchantedLearning.com Regular Polyhedra or Platonic Solids: Tetrahedron, Cube, Octahedron, Dodecahedron, Icosahedron 
The five regular polyhedra were discovered by the ancient Greeks. The Pythagoreans knew of the tetrahedron, the cube, and the dodecahedron; the mathematician Theaetetus added the octahedron and the icosahedron. These shapes are also called the Platonic solids, after the ancient Greek philosopher Plato; Plato, who greatly respected Theaetetus' work, speculated that these five solids were the shapes of the fundamental components of the physical universe.
Platonic Solid  Picture  Number of Faces  Shape of Faces  Number of Faces at Each Vertex  Number of Vertices  Number of Edges  Unfolded Polyhedron (Net)  Dual (The Platonic Solid that can be inscribed inside it by connecting the midpoints of the faces) 

Tetrahedron  4  Equilateral Triangle (3sided) 
3  4  6  Tetrahedron  
Cube  6  Square (4sided) 
3  8  12  Octahedron  
Octahedron  8  Equilateral Triangle (3sided) 
4  6  12  Cube  
Dodecahedron  12  Regular Pentagon (5sided) 
3  20  30  Icosahedron  
Icosahedron  20  Equilateral Triangle (3sided) 
5  12  30  Dodecahedron 
TETRAHEDRON Make a paper tetrahedron, a pyramid formed by four triangles. 
TETRAHEDRON FROM A SMALL ENVELOPE This is an incredibly easy way to make a tetrahedron (a pyramid) from a small envelope. 
CUBE Make a paper cube, a solid geometric figure with six square faces. 
OCTAHEDRON Make a paper octahedron. An octahedron is an eightsided regular geometric solid. 
DODECAHEDRON Make a paper dodecahedron. A dodecahedron is a twelvesided regular geometric solid composed of pentagons. 
ICOSAHEDRON Make a paper icosahedron. An icosahedron is a twentysided regular geometric solid composed of equilateral triangles. 
Match Each Regular Polyhedron to Its Name and Its Unfolded Form Draw lines between each Platonic solid (regular polyhedron), its name, and its unfolded form. Polyhedra: tetrahedron, cube, octahedron, dodecahedron, icosahedron. Or go to the answers. 
Unfolding 3D Shapes: Cube and Tetrahedron Nets Draw an unfolded cube and tetrahedron. Or go to the answers. 
Polyhedra: FillintheBlanks Fill in the name, number of faces, net, number of vertices, number of edges, and shape of the faces for five polyhedra (tetrahedron, cube, octahedron, dodecahedron, and icosahedron). Or go to the answers. 
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