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求二面角的大小是立体几何的一个重点问题,而求无棱二面角是该重点的难点.以下通过一道高考题,介绍几种求无棱二面角的常用方法.
The size of the dihedral angle is a key problem in the three-dimensional geometry, and finding the dihedral angle is the difficult point. The following is a common method for obtaining dihedral angles without an edge because of a college entrance examination question.