Icosahedron - Wikipedia In geometry, an icosahedron ( ˌaɪkɒsəˈhiːdrən, - kə -, - koʊ - or aɪˌkɒsəˈhiːdrən [1]) is a polyhedron with 20 faces The name comes from Ancient Greek εἴκοσι (eíkosi) 'twenty' and ἕδρα (hédra) 'seat' The plural can be either "icosahedra" ( - drə ) or "icosahedrons"
Icosahedron The icosahedron's definition is derived from the ancient Greek words Icos (eíkosi) meaning 'twenty' and hedra (hédra) meaning 'seat' It is one of the five platonic solids with equilateral triangular faces
Spinning Icosahedron - Math is Fun For a regular icosahedron (where all faces are equilateral triangles): The name icosahedron comes from the Greek icosa- meaning 20, because it is a polyhedron with 20 faces When we have more than one icosahedron they are called icosahedra
Icosahedron - Math. net An icosahedron is a polyhedron with 20 faces The prefix "icosa" means twenty When "icosahedron" is used without any qualifiers, we assume that it is a regular icosahedron, which is an icosahedron in which the 20 faces are all equilateral triangles An icosahedron is a three-dimensional figure made up of only polygons
Regular Icosahedron -- from Wolfram MathWorld The regular icosahedron, often simply called "the" icosahedron, is the regular polyhedron and Platonic solid illustrated above having 12 polyhedron vertices, 30 polyhedron edges, and 20 equivalent equilateral triangle faces, 20 {3}
Icosahedron – The Geometry of Thinking The icosahedron is distinguished from the other regular polyhedra in that it has an irrational volume both in tetrahedra and cubes Its isolation is further reinforced by its axes of spin and the 31 great circles they describe
Icosahedron: Definition, Properties Real-Life Examples - Vedantu An icosahedron is a three-dimensional geometric shape, specifically a polyhedron, that has exactly 20 faces In its most common form, the regular icosahedron, all faces are identical equilateral triangles
Icosahedron - Interactive Mathematics The icosahedron is one of the five Platonic solids, which are 3D geometric shapes with identical faces and angles It has 20 faces, 30 edges, and 12 vertices It is also one of the polyhedra, which are 3D shapes that are made up of flat surfaces