Platonic solid - Wikipedia, the free encyclopedia
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In geometry, a Platonic solid is a convex polyhedron that is regular, in the sense of a regular polygon. Specifically, the faces of a Platonic solid are congruent regular polygons, with the same num...
en.wikipedia.org/wiki/Platonic_solid
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The Five Platonic Solids ... It is convenient to identify the platonic solids with the notation {p, q} where p is the number of sides in each face and q is the number faces that meet at each vertex. Thus, the cube is {4, 3} because it consists of squares meeting three to a vertex.
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www.georgehart.com/virtual-polyhedra/platonic-info.html
www.georgehart.com/virtual-polyhedra/platonic-info.html
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The Greeks recognized that there are only five platonic solids. But why is this so? The key observation is that the interior angles of the polygons meeting at a vertex of a polyhedron add to less than 360 degrees.
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www.math.utah.edu/~alfeld/math/polyhedra/polyhedra.html
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Considering the Platonic Solids, there are five so named because they were known at the time of Plato circa (427-347 BC). These polyhedra are also called regular polyhedra because they are made up of faces that are all the same regular polygon.
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www.ul.ie/~cahird/polyhedronmode/photo.htm
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Presumably this formed the basis of the constructions of the Platonic solids that constitute the concluding Book XIII of Euclid's Elements.
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www.mathpages.com/home/kmath096.htm
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Regular Polyhedra or Platonic Solids: Tetrahedron, Cube, Octahedron, Dodecahedron, Icosahedro ... There are only five geometric solids that can be made using a regular polygon and having the same number of these polygons meet at each corner. The five Platonic solids (or regular polyhedra) are the tetrahedron, cube,
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www.enchantedlearning.com/math/geometry/solids/
www.enchantedlearning.com/math/geometry/solids/
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Platonic Solids, an exposition from the Platonic Realms Interactive Math Encyclopedia. ... he so-called Platonic Solids are regular polyhedra. “Polyhedra” is a Greek word meaning “many faces.” There are five of these, and they are characterized by the fact that each face is a regular polygon, that is,
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www.mathacademy.com/pr/prime/articles/platsol/index.asp
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The Platonic solids were admired and adored by the ancient Greek mathematicians and anyone learning computer graphics rediscovers their wonder. ... The Platonic Solids and one odd-ball Polyhedron...
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www.frontiernet.net/~imaging/polyh.html
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