icosahedron

[ UK /ˌa‍ɪkəsɐhˈiːdɹən/ ]
NOUN
  1. any polyhedron having twenty plane faces
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How To Use icosahedron In A Sentence

  • In particular he identified the five elements, fire, earth, air, water and celestial matter with the five regular solids, the tetrahedron, cube, octahedron, icosahedron and the dodecahedron.
  • Theaetetus was the first to study the octahedron and the icosahedron and it is believed that Book XIII of Euclid's Elements is based on his work.
  • You may note that the spheres sit more or less on the vertices of an icosahedron, which is why this configuration is called the icosahedral arrangement.
  • Then, about 10 years ago, the mathematician Reidun Twarock developed a more general theory of the geometry of viruses based on the symmetries of the icosahedron, but using shapes in six dimensions, not three. New Angles on Biology
  • Earth was a cube, air an octahedron, fire a tetrahedron and water an icosahedron.
  • Water was an icosahedron, and air had to be an octahedron.
  • This set of five polyhedra came with the faces already numbered, to make it easy to see that there were 12 sides on a dodacahedron, or 20 on an icosahedron, which made them easy to use as dice. The Braunstein Game « Isegoria
  • These are often known as the Platonic solids: the tetrahedron, cube, octahedron, dodecahedron and icosahedron.
  • Plato, the dialectician, condescended to allow to God the liberty of making five worlds; because, said he, there are five regular solids in geometry, the tetrahedron, the cube, the hexahedron, the dodecahedron, and the icosahedron. A Philosophical Dictionary
  • The icosahedron is one of only five regular convex polyhedrons, the symmetric ‘Platonic solids’ that fascinated the ancient Greeks (the cube is another).
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