n.九角形，九边形

The enneagon is a polygon with nine sides and nine angles.
九边形是一个有九条边和九个角的多边形。
In geometry, an enneagon is a figure that is more complex than an octagon but less so than a decagon.
在几何学中，九边形比八边形复杂，但不如十边形复杂。
The ancient Greeks used the enneagon in their architectural designs for decorative patterns.
古希腊人在建筑设计中使用九边形作为装饰图案。
The regular enneagon can be constructed using a straightedge and compass, though it's more challenging than constructing a hexagon.
规则的九边形可以使用直尺和圆规来构造，尽管这比构造六边形要更具挑战性。
Many flags incorporate geometric shapes like the enneagon to represent unity or historical significance.
许多国旗采用九边形等几何形状来象征团结或历史意义。
In sacred geometry, the enneagon symbolizes spiritual growth and integration of diverse aspects of life.
在神圣几何学中，九边形象征着精神成长和生活各方面的整合。
A nine-pointed star, often based on an enneagon, is a symbol in various cultural and religious traditions.
九芒星，通常基于九边形，是多种文化和宗教传统中的符号。
The interior angles of an enneagon sum up to 1260 degrees, a fact that students learn in geometry class.
九边形的内角之和为1260度，这是学生们在几何课上会学到的知识。
Some modern artists experiment with enneagons to create unique patterns and optical illusions in their artwork.
一些现代艺术家通过九边形来实验，创造出独特的图案和视觉错觉在他们的艺术作品中。
In the study of polygons, the enneagon is a case study for understanding the properties and symmetries of non-regular polygons.
在多边形的研究中，九边形是理解非规则多边形属性和对称性的案例研究。