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求平面几何图形阴影部分面积的方法有两种类型:一是求规则图形(如三角形、矩形、梯形和扇形等)的面积;二是求不规则图形的面积.对于前一种可直接应用面积公式求其面积,比较简单,在此不再赘述.对于后一种,则需转化为规则图形的面积问题求解.下商主要列举后一种图形面积问题的几种求法: 一、利用“和差”求阴影部分的面积解题思想主要是把不规则的图形分割成几个规
There are two types of methods for calculating the area of the shadow of a planar geometric figure: one is to find the area of regular graphics (such as triangles, rectangles, trapezoids, and sectors, etc.); the other is to find the area of irregular graphics. For the former one can directly use the area The formula to find the area is relatively simple, and it will not be repeated here. For the latter one, it needs to be converted into the area problem of the regular graph. The following quotient mainly lists the following methods for solving the problem of the area of the graph: The idea of solving problems with the area of shadows is mainly to divide irregular patterns into several rules.