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求某个平面图形的面积是中考、竞赛中的常见题型,这些图形多数是由一些规则图形组合、重叠而成的图形．下面举例说明解这类题的方法．一、和差法对于求图形面积问题,计算时往往将所求图形的面积转化为规则图形的面积的和
Finding the area of a plane graphic is a common question type in Chinese exams and contests. Most of these graphs are composed of a combination of regular patterns and overlapping graphs. Below is an example of how to solve such a problem. First, the sum-difference method is used to calculate the area of the graph. When calculating, the area of the calculated graph is often converted into the sum of the area of the regular graph.