求图形阴影部分面积是中考的重要内容之一.这些题目除了考查基础知识之外,还重视对数学方法的考查,对数学思想的理解和应用.现以2013年中考试题为例,对各类解法举例说明.一、利用面积公式求面积例1(2013年重庆卷)如图1,一个圆心角为90°的扇形,半径OA=2,那么阴影部分的面积为(结果保留π). Seeking shaded area is one of the important content of the senior high school entrance examination.In addition to examining the basic knowledge of these topics, but also emphasis on the test of mathematical methods, the understanding and application of mathematical ideas.Taking 2013 exam questions as an example, Solution Example 1. Area Using Area Formula Example 1 (Chongqing 2013) Figure 1, a sector with a central angle of 90 °, with radius OA = 2, then the area of ​​the shaded area is (the result is reserved for π).