- 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
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
great triambic icosahedron and
medial triambic icosahedron (or
midly triambic icosahedron) are
visually identical dual
uniform polyhedra...
-
tridiminished icosahedron is a
Johnson solid that is
constructed by
removing three pentagonal pyramids from a
regular icosahedron. The
tridiminished icosahedron can...
- its side and thus
appears in the
construction of the
dodecahedron and
icosahedron. A
golden rectangle—that is, a
rectangle with an
aspect ratio of φ...
- Jessen's
icosahedron,
sometimes called Jessen's
orthogonal icosahedron, is a non-convex
polyhedron with the same
numbers of vertices, edges, and faces...
- In geometry, the
great icosahedron is one of four Kepler–Poinsot
polyhedra (nonconvex
regular polyhedra), with Schläfli
symbol {3,5⁄2} and Coxeter-Dynkin...
- cube, and
dodecahedron and that the
discovery of the
octahedron and
icosahedron belong to Theaetetus, a
contemporary of Plato. In any case, Theaetetus...
