立体几何是高考的必考内容,而且题目越来越难,教学中我发现学生遇到了很多障碍,如如何做辅助线,射影落在什么位置,如何找线面角、二面角等等。因此,我也不断探索,不断反思:立体几何该如何引入,该如何培养学生的立体感。现在新教材中有了空间向量,空间向量理论引入立体几何中,通常涉及到夹角、平行、垂直、距离等问题,其方法是不需要添加复杂的辅助线,只要建立适当的 Three-dimensional geometry is the college entrance examination must-have content, but the subject is more and more difficult, teaching, I found that students encountered many obstacles, such as how to do auxiliary line, projective fall in what position, how to find line angle, dihedral angle and so on. Therefore, I also continue to explore, continue to reflect on: how to introduce three-dimensional geometry, how to develop a sense of three-dimensional students. Now there is a space vector in the new textbook. The introduction of space vector theory into solid geometry usually involves the problems of angle, parallelism, verticality and distance. The method does not need to add complex auxiliary lines, so long as the appropriate