- In geometry, an
icosahedron (/ˌaɪkɒsəˈhiːdrən, -kə-, -koʊ-/ or /aɪˌkɒsəˈhiːdrən/) is a
polyhedron with 20 faces. The name
comes from
Ancient Gr**** εἴκοσι...
- In geometry, the
regular icosahedron (or
simply icosahedron) is a
convex polyhedron that can be
constructed from
pentagonal antiprism by
attaching two...
- In geometry, the
truncated icosahedron is a
polyhedron that can be
constructed by
truncating all of the
regular icosahedron's vertices. Intuitively, it...
- In geometry, the
great icosahedron is one of four Kepler–Poinsot
polyhedra (nonconvex
regular polyhedra), with Schläfli
symbol {3,5⁄2} and Coxeter-Dynkin...
- In geometry, the
triakis icosahedron is an
Archimedean dual solid, or a
Catalan solid, with 60
isosceles triangle faces. Its dual is the
truncated dodecahedron...
- In geometry, the
metabidiminished icosahedron is one of the
Johnson solids (J62). The name
refers to one way of
constructing it, by
removing two pentagonal...
- cube, and
dodecahedron and that the
discovery of the
octahedron and
icosahedron belong to Theaetetus, a
contemporary of Plato. In any case, Theaetetus...
-
represented by its Schläfli
symbol {5, 3}. The dual
polyhedron is the
regular icosahedron {3, 5},
having five
equilateral triangles around each vertex. The convex...
-
perhaps only one has been
found to be a true
icosahedron, as
opposed to a
reinterpretation of the
icosahedron dual, the dodecahedron. It is also possible...
-
tridiminished icosahedron is a
Johnson solid that is
constructed by
removing three pentagonal pyramids from a
regular icosahedron. The
tridiminished icosahedron can...
