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。
Two new flame feature vectors are defined: one is the flame detection context based dynamic feature row and the other is the optimal flame feature area vector.
算法定义了两种新的火焰特征向量：火检上下文动态特征切入列，火焰特征最优区域。
You will get some sort of mesh grid on your surface and you will look at a little parallelogram that is an elementary piece of that mesh and figure out what is its area and normal vector.
在曲面上做一些网格，你会看到一个网上的每一小块儿，都是小的平行四边形，我们要弄清楚它的面积和法向量是什么。
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