由于几何图形中阴影部分往往都是不规则图形,所以把不规则的图形的面积问题转化为规则图形的面积是解决这类问题的主要思想.以下介绍几种常用的方法.一、和差法用几个规则图形面积的和、差来计算阴影部分的面积,是求不规则阴影部分面积的基本方法.例1如图1,已知矩形ABCD中,AB=1 Since the shaded parts of the geometry are often irregular graphics, so the irregular graphics area problems into regular graphics area is the main idea to solve such problems. Here are some commonly used methods. Calculating the area of ​​the shaded area by the sum and difference of several regular pattern areas is the basic method of finding the area of ​​the irregular shaded area Example 1 As shown in Figure 1, AB = 1