求图中阴影部分的面积是中考试题中比较常见的问题 .解此类问题 ,方法灵活多变 ,有一定的技巧性 .现分类举例说明 ,供读者参考 .一、旋转变形法旋转变形法就是将一个图形旋转变换为与它的面积相等的另一个具有规则的图形来计算面积例 1　 ( 2 0 0 2年广西省中考题 )如图 1,三个 Find the area of ​​the shadow in the picture is the more common problem in the exam questions. Solve this kind of problem, the method is flexible, there is a certain degree of skill. The classification of examples for the reader reference. One, rotary deformation method is the rotation deformation method is Rotate a graph into another area with its area equal to the area with a regular graph to calculate the area. Example 1 (Guangxi Province Exam Questions in 2000) Figure 1, Three