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nonconvex great rhombicosidodecahedron
In geometry, the nonconvex great rhombicosidodecahedron is a nonconvex uniform polyhedron, indexed as U67. It is also called the quasirhombicosidodecahedron. It is given a Schläfli symbol t0,2. Its vertex figure is a crossed quadrilateral.
This model shares the name with the convex ''great rhombicosidodecahedron'', also known as the truncated icosidodecahedron.
== Cartesian coordinates ==
Cartesian coordinates for the vertices of a nonconvex great rhombicosidodecahedron are all the even permutations of
: (±1/τ2, 0, ±(2−1/τ))
: (±1, ±1/τ3, ±1)
: (±1/τ, ±1/τ2, ±2/τ)
where τ = (1+√5)/2 is the golden ratio (sometimes written φ).
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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