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环节一复习回顾师:请用尺规画出线段AO的垂直平分线。生:画图(如图所示)师:画好的直线上任意一点P到线段两个端点A、0的距离有什么关系?生:相等。由线段垂直平分线性质得到的。师:那通过PA=PO我们又可以得到什么结论:生:△PAO是等腰三角形。
Review a link review division: Please use the ruler to draw the vertical bisector AO line. Students: Drawing (as shown) Teacher: Draw a good point on any point P to the two ends of the line segment A, 0 What is the relationship? Health: Equal. Derived from the perpendicular bisector of the line segment. Teacher: What can we get through PA = PO? Student: △ PAO is an isosceles triangle.