| 词条 | Hexadecahedron |
| 释义 |
A hexadecahedron (or hexakaidecahedron) is a polyhedron with 16 faces. No hexadecahedron is regular; hence, the name is ambiguous. There are numerous topologically distinct forms of a hexadecahedron, for example the pentadecagonal pyramid, tetradecagonal prism and heptagonal antiprism. Convex hexadecahedraThere are 387,591,510,244 topologically distinct convex hexadecahedra, excluding mirror images, having at least 10 vertices.[1] (Two polyhedra are "topologically distinct" if they have intrinsically different arrangements of faces and vertices, such that it is impossible to distort one into the other simply by changing the lengths of edges or the angles between edges or faces.) Self-dual hexadecahedraThere are 302,404 self-dual hexadecahedron, 1476 with at least order 2 symmetry.[2] The high symmetry self-dual has chiral tetrahedral symmetry, and can be seen topologically by removing 4 of 20 vertices of a regular dodecahedron and is called a tetrahedrally diminished dodecahedron. References1. ^Counting polyhedra 2. ^Symmetries of Canonical Self-Dual Polyhedra
External links{{Polyhedra}}{{polyhedron-stub}} 1 : Polyhedra |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。