n.多边形，多角形

A polygon is a two-dimensional shape with three or more straight sides and angles.
多边形是一种二维形状，有三个或更多直角边和角。
The regular pentagon has five equal sides and five equal angles.
正五边形有五个相等的边和五个相等的角。
The polygon's perimeter is the total length of its sides.
多边形的周长是其所有边的总长度。
In a hexagon, you can find six interior angles that sum up to 720 degrees.
在六边形中，六个内角之和为720度。
The irregular polygon doesn't have equal sides or angles.
不规则多边形没有相等的边或角。
A nonagon is a nine-sided polygon, also known as a enneagon.
九边形是一种有九条边的多边形，也称为九角形。
Polygons are fundamental to geometry and can be used to create tessellations.
多边形是几何学的基础，可以用来创建镶嵌图案。
The area of a triangle can be calculated using Heron's formula for any polygon with three sides.
三角形的面积可以通过海伦公式计算出任何具有三条边的多边形。
Convex polygons have all their interior angles less than 180 degrees, while concave polygons have at least one angle greater than 180 degrees.
凸多边形的所有内角小于180度，而凹多边形至少有一个角大于180度。
A polygon can be inscribed in a circle if the sum of its exterior angles equals 360 degrees.
如果一个多边形的外部角之和等于360度，那么它可以内切于一个圆。