三维空间中的正多面体只有五种,它们是:正四面体、立方体、正八面体、正十二面体和正二十面体。我们可以用欧拉定理给出一个简单的证明。先简单叙述一下欧拉定理:简单多面体的顶点数(v)、面数(f)、边数(e)之间有关系v+ There are only five regular polyhedrons in three-dimensional space: regular tetrahedrons, cubes, regular octahedrons, regular dodecahedrons, and regular icosahedrons. We can use Euler’s theorem to give a simple proof. First briefly describe the Euler’s theorem: the relationship between the number of vertices (v), number of faces (f), and number of sides (e) of a simple polyhedron v+