## Prismatoid Polyhedr: Tetrahedron, Octahedron, Parallelepiped, Cube, Antiprism, Frustum, Prismatoid, Cuboid, CupolaPlease note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 28. Chapters: Tetrahedron, Octahedron, Parallelepiped, Cube, Antiprism, Frustum, Prismatoid, Cuboid, Cupola, Pyramid, Prismatic uniform polyhedron, Pentaprism, Triangular prism, Square pyramid, Hexagonal prism, Pentagonal pyramid, Square antiprism, Rhombohedron, Pentagonal antiprism, Wedge, Pentagonal cupola, Square cupola, Pentagrammic prism, Triangular cupola, Hexagonal pyramid, Octagonal prism, Pentagonal prism, Pentagrammic crossed-antiprism, Heptagonal antiprism, Apeirogonal prism, Hyperrectangle, Hexagonal antiprism, Octagonal antiprism, Apeirogonal antiprism, Dodecagonal prism, Decagonal antiprism, Enneagrammic crossed-antiprism, Pentagrammic antiprism, Octagrammic prism, Heptagrammic prism, Heptagrammic crossed-antiprism, Octagrammic crossed-antiprism, Decagrammic prism, Enneagrammic antiprism, Enneagrammic prism, Enneagonal prism, Heptagrammic antiprism, Decagrammic antiprism, Octagrammic antiprism, Hendecagonal prism, Heptagonal prism, Enneagonal antiprism, Dodecagonal antiprism. Excerpt: In geometry, a tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. A regular tetrahedron is one in which the four triangles are regular, or "equilateral," and is one of the Platonic solids. The tetrahedron is the only convex polyhedron that has four faces. The tetrahedron is the three-dimensional case of the more general concept of a Euclidean simplex. The tetrahedron is one kind of pyramid, which is a polyhedron with a flat polygon base and triangular faces connecting the base to a common point. In the case of a tetrahedron the base is a triangle (any of the four faces can be considered the base), so a tetrahedron is also known as a triangular pyramid. Like all convex polyhedra, a tetrahedron can be folded from a single sheet of paper. It has two nets. For any tetrahe... |

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