Geometry describes locations on a flat (i.e. Euclidean) plane, and can be used to determine information such as the shape and area of a polygon.
Geometry描述扁平(比如欧几里得)平面上的位置，并可用来判定诸如多边形形状和面积之类的信息。
Give a definition about area vector of a polygon on the plane and its formula, area formula of a polygon can be sought by it.
给出平面上多边形的面积矢量的定义及公式，并应用它求出多边形的面积公式。
We have proposed an arithmetic of this kind to eliminate the vertex in a circling way, ignoring the knaggy character and the deasil or anticlockwise direction of the plane polygon.
概述了平面多边形三角形剖分的各种算法，提出了一种不考虑多边形的凸凹性、顶点顺时针或逆时针走向循环消除顶点的平面多边形三角剖分算法，并给出了实例。
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