平移和旋转是常见的几何变换 ,借助这些变换 ,可以使问题中的条件相对集中 ,从而起到化难为易 ,出奇制胜的效果 .下面举例谈谈图形的平移和旋转在解题中的应用 .例 1　求下列图形中的阴影部分的面积 .分析　图 1中阴影部分面积可以通过分割 ,分别求出Ⅰ和Ⅱ的面积 ,然后计算SⅠ Translation and rotation are common geometric transformations. With these transformations, the conditions in the problem can be relatively concentrated, thus achieving the effect of making things difficult and easy to achieve. The following example discusses the application of the translation and rotation of a graph in solving problems. 1 Find the area of ​​the shaded area in the following figure. Analyze the area of ​​the shaded area in Figure 1 by dividing it, find the area of ​​I and II, and then calculate SI.