正八面体 Octahedron
（重定向自Octahedra）
![](/Images/godic/202501/30/Octahedron4825.jpg")
![](/Images/godic/202501/30/Octahedron_vertfig4825.png")
![](/Images/godic/202501/30/Octahedron4826.png")
![正八面体共有11种不同的展开图](/Images/godic/202501/30/Octahedron_flat.svg4826.png")
正八面体由八个等边三角形，分别为上、下各四个三角形与一个正方形组成的正方锥体，上下黏合在一起而构成，是五种正多面体的第三种，有6个顶点和12条边。正八面体也是正三角反棱柱。正八面体是三维的正轴形，施莱夫利符号{3,4}，考克斯特—迪肯符号![](/Images/godic/202501/30/CDel_node_14826.png"){kind=small}
![](/Images/godic/202501/30/CDel_34826.png"){kind=small}
![](/Images/godic/202501/30/CDel_node4826.png"){kind=small}
![](/Images/godic/202501/30/CDel_44826.png"){kind=small}
。
正八面体每四条棱可以成为一个正方形，共有三个独立的正方形。
八面体 |
octahedra
/ˌɔktə'hedrə/
英汉-汉英词典
n. 八面体(octahedron的复数)
词组 | 习惯用语
您要查找的是不是：
- cathedral n. 大教堂
- octahedron n. 八面体
- tetrahedral adj. 有四面的；四面体的
- dodecahedra 十二面体
octahedra n. 正八面体
网络短语:
octahedra octahedron 的复数
oxygen octahedra 氧八面体
cornersharing octahedra 共顶八面体
edge-sharing octahedra 共棱八面体
PbS octahedra PbS八面体
face-sharing octahedra 共面八面体
cubic octahedra 立方八面体
Compound of five octahedra 五复合正八面体
tilting of oxygen octahedra 氧八面体扭转
中文百科
英语百科
Octahedron 正八面体
（重定向自Octahedra）
![](/Images/godic/202501/30/Octahedron4826.jpg")
![](/Images/godic/202501/30/Octahedron_vertfig4826.png")
![](/Images/godic/202501/30/Hexahedron4826.png")
In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.
A regular octahedron is the dual polyhedron of a cube. It is a rectified tetrahedron. It is a square bipyramid in any of three orthogonal orientations. It is also a triangular antiprism in any of four orientations.