Friday, October 15, 2010

Implantation Bleeding Visible On Ultrasound

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Polyhedra regular
In geometry, flat-faced solids are called "polyhedra." (In Greek, polys = "multiple" and Hedra = "face".) Polyhedra whose faces are equal regular polygons are called regular polyhedra . There are five regular polyhedrons:

  • hexahedron (6 square)
  • Tetrahedron (4 equilateral triangles)
  • Dodecahedron (12 regular pentagons)
  • Icosahedron (20 equilateral triangles)
  • Octahedron (8 equilateral triangles)
  • Here is a picture of these polyhedra

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