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。
Although the bounding box is a polygon defining the area represented for the user, I simplify and use one point of this data.
尽管这个边界框是一个用于定义表示用户的区域的多边形，但我简化并使用该数据的一个点。
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。
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