浙江文科的立体几何问题中,2010年是线面角问题,2011年是二面角问题,2012年是线面角问题。线面角问题是立体几何中的一个主要题型。线面角问题的处理有很多种方法,本文就只针对立体几何法展开探究。线面角问题对学生来说难点在于线面角的寻找,下面我们分三个层次谈谈如何寻找线面角。线面角的确定关键是确定斜线的投影线,投影线确定的关键是 Among the three-dimensional geometric problems of Zhejiang liberal arts, 2010 is the line angle problem, 2011 is the dihedral angle problem and 2012 is the line angle problem. Line angle problem is a major problem in the three-dimensional geometry. There are many ways to deal with the fillet problem, this article only for the three-dimensional geometry method to explore. Line angle problems For students, the difficulty lies in the line angle to find, here we talk about how to find line angle in three levels. Line angle determination is the key to determine the diagonal projection line, the projection line is the key to determine