调用该函数来计算面积。
则分别以点 为三角形顶点计算面积并求和即可。
Point of the triangle is the vertex of each area and the sum can be calculated.
默认:计算面积,范围,以适应网页:最小规模和最大规模的的物业计算。
Default: calculated to fit the webpage in the area available, Range: calculated with minimum-scale and maximum-scale properties.
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