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求与圆相关的阴影部分面积是中考的一个热点.解决这类问题一般需要作辅助线,把不规则图形的面积转化成面积的和或差.现以2009年的中考题为例,说明这类题的解法.
Seeking the shadow area associated with the circle is a hot spot in the exam .To solve these problems generally need to be auxiliary lines, the area of irregular graphics into the sum of the area or difference .Considering the 2009 senior high school entrance examination questions as an example, indicating that this Solutions to the problem.