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在平面几何中,把各边等长而且诸内角皆相等的多边形定义为正多边形,易见正多边形有一个对称中心,它和其各顶点距离相等,而且正多边形的另一特征性质乃是其顶点共圆的等边多边形.同样地,在立体几何中,把各个面皆为互相全等的正多边形,而且各棱的两面角皆相等的多面体定义为正多
In plane geometry, a polygon with equal length on each side and equal internal angles is defined as a regular polygon. It is easy to see that the regular polygon has a center of symmetry which is equal to the distance between its vertices and another characteristic feature of the regular polygon is its Similarly, in the solid geometry, each of the faces is a regular polygon that is equal to each other, and the polyhedron having the same dihedral angle of each edge is defined as a positive polygon