勾股定理是平面几何中一个重要定理,其应用非常广泛.在解有关试题时,常常会遇到所给的旋转变换解题更是一种极为重要的数学思维方法.应用旋转变换,可以把图形中分散的元素相对集中起来,使图形内各要素的联系变得 Pythagorean theorem is an important theorem in plane geometry, and its application is very extensive. When solving related questions, it is often encountered that the given rotation transformation is a very important mathematical thinking method. Using the rotation transformation, Decentralized elements in the graphic are relatively concentrated, so that the links between the various elements of the graphic become