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二面角问题将线与线、线与面的平行、垂直的判定结合在一起,成为融汇立体几何知识与方法的典型问题。因而二面角问题在历年高考试题中屡次出现,年年必考,但只给出两个面的一个公共点,而未给出棱的二面角的问题,则是首次在2001年高考试题中才出现。未给出棱的二面角的问题,对空间想象能力的要求更高,寻求解题人口时,需要对图形进行变换与综合,思路方向及具体解法可分为两大类四种方法:一、找
The dihedral angle problem combines the parallel and vertical determination of lines and lines, lines and surfaces, and becomes a typical problem of fusion solid geometry knowledge and methods. Therefore, the dihedral angle problem has repeatedly appeared in the high examination questions of the calendar year, and must be taken year after year. However, only one common point of two sides is given, and the issue of not giving the rib angle of the dihedral angle is the first time in the 2001 examination questions. Appeared in the middle. The problem of not providing the dihedral angle of the ribs is more demanding on spatial imagination ability. When seeking the problem-solving population, the graphs need to be transformed and synthesized. The direction of the ideas and specific solutions can be divided into two major categories of four methods: ,Find