oxygon

例句：

1. 1. The octagon is a regular polygon with eight sides.
   八边形是一个规则的多边形，有八个边。
2. 2. In mathematics, an oxygon is defined as a polygon whose interior angle sum is 180 degrees.
   在数学中，一个内角和为180度的多边形称为正多边形。
3. 3.The octagon has an octagonal symmetry, which means that the shape can be divided into eight equal parts by lines drawn across it.
   八边形具有八边形对称性，这意味着可以通过在其上画线将其分割成八个相等的部分。