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教师用幻灯显示图１．教师点题：过圆上一点Ａ有一条直线ＡＢ（用一根红色小棒代表），现在我们把这条直线绕点Ａ旋转起来，看它在这运动变化过程中，有什么规律性的东西值得研究？（１）一个过程，几种看法教师演示，并引导学生观察，幻灯片上打出如下一系列图形（图２）：观
The teacher uses a slideshow to display Figure 1. Teacher’s question: On the circle A, there is a straight line AB (represented by a small red bar), and now we rotate this line around point A to see if it has any regular value in the course of this movement. the study? (1) A process, several views of teacher demonstrations, and guide students to observe, the following series of graphics on the slide (Figure 2): view