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Edge-contracted icosahedron
In geometry, an edge-contracted icosahedron is a polyhedron with 18 triangular faces, 27 edges, and 11 vertices with C2v symmetry, order 4.
== Construction ==
It can be constructed from the regular icosahedron, with one edge contraction, removing one vertex, 3 edges, and 2 faces. This contraction distorts the circumscribed sphere original vertices. With all equilateral triangle faces, it has 2 sets of 3 coplanar equilateral triangles (each forming a half-hexagon), and thus is not a Johnson solid.
If the sets of coplanar triangles are considered a single face (called a triamond〔http://www.interocitors.com/polyhedra/Triamonds/〕), it has 10 vertices, 22 edges, and 14 faces, 12 triangles 20px and 2 triamonds 40px.
It may also be described as having a hybrid square-pentagonal antiprismatic core (an antiprismatic core with one square base and one pentagonal base); each base is then augmented with a pyramid.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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