所谓补形法,就是在平面几何证题中,如果题目给出的几何图形是我们熟悉图形的一部分,这时可以在图形上添加辅助线,使之成为一个完整的特殊的几何图形(如等腰三角形、直角三角形、正方形、圆等),这样有助于从整体出发,揭示图形的内在联系,容易找到证题途 The so-called complement method, that is, in the plane geometry test, if the geometry given by the topic is part of the familiar graphics, then you can add auxiliary lines to the graphic to make it a complete special geometry (such as Waist triangles, right-angled triangles, squares, circles, etc.) This helps to start from the whole, revealing the internal connections of the graphs, and easily finding answers to questions.