Polyhedra with seven vertices are rare . 具有七个顶点的多面体是稀少的。
This leads us to another contribution of leonhard euler to graph theory, namely euler's polyhedron theorem or simply euler's formula . 这是我们引向L尤拉对图论的另一个贡献,即尤拉多面体定理,或简称尤拉公式。
Regular polyhedra can be divided into 3 groups 正多面体有一个特色,可以分成三组。
This property is called the duality of regular polyhedra 这称为正多面体的二重性。
The edges of a regular polyhedron are always equal 所有正多面体的边均只有一种长度。