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二面角是立体几何的重要概念之一，也是较难学的一部分内容。学生在学习过程中，常会出现“打车”现象。在这种情况下，教师应注意引导，认真回顾第一章的内容，探讨研究问题的思路，通过回忆、分析，不难发现，“降维”是这一章的常见手法。二面角问题，大多都是通过转化为平
Dihedral is one of the important concepts of solid geometry, but also more difficult to learn part of the content. Students in the learning process, often a “taxi” phenomenon. Under such circumstances, teachers should pay attention to guide and carefully review the contents of the first chapter to explore ideas for researching problems. It is easy to find out through recalling and analyzing that “dimension reduction” is a common practice in this chapter. Dihedral problems, mostly through the transformation into peace