File:Icosahedron.png · Wikimedia Commons · See Wikimedia Commons
icosahedron
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In geometry, an icosahedron ( or ) is a polyhedron with 20 faces. The name comes . The plural can be either "icosahedra" () or "icosahedrons".
Wikidata facts
- Subclass of
- polyhedron
- Follows
- enneadecahedron
- Image
- Plato-20.png
- Has parts of class
- face
Show 7 more facts
- different from
- regular icosahedron
- maintained by WikiProject
- WikiProject Mathematics
- Commons category
- Icosahedron
- has facet polytope
- polygon
- Commons gallery
- Icosahedron
- studied by
- solid geometry
- described by source
- Encyclopædia Britannica 11th edition
Sources (2)
via Wikidata · CC0
~6 min read
Encyclopedic overview
5 sectionsContents
- Regular icosahedra
- Pyritohedral icosahedra
- Other icosahedra
- See also
- References
In geometry, an icosahedron ( or ) is a polyhedron with 20 faces. The name comes . The plural can be either "icosahedra" () or "icosahedrons".
There are infinitely many non-similar shapes of icosahedra, some of them being more symmetrical than others. The best known is the (convex, non-stellated) regular icosahedron—one of the Platonic solids—whose faces are 20 equilateral triangles.
Excerpted from Wikipedia’s “icosahedron” article, available under the CC BY-SA 4.0 licence.