通过图形的运动、变化,往往能获得对图形性质的猜测,图形的运动、变化也是探究几何问题思路、寻找解决几何问题方法的重要途径.通过具体实例认识平面图形关于旋转中心的旋转和图形的相似,探索它们的基本性质是“课标”对图形的旋转和相似的基本要求.下面从图形的旋转的角度对相似三角形中的一道课本练习题作动态探究. Through the movement and change of graphics, it is often found that guesses about the nature of the graphics, the movement of the graphics, and the changes are also important ways to explore the ways of solving the geometric problems and find solutions to the problems of the geometric problems. Similarly, exploring the basic nature of them is the basic requirement of the “class standard” on the rotation and similarity of graphics.An example of a textbook in a similar triangle is dynamically explored from the perspective of graphics.