二面角是立体几何的重要内容,它的大小与其平面角的大小相同,故求解此类问题的关键是作其平面角,然后将平面角置于某三角形中计算获解.不少学生作平面角困难,计算亦困难,为此,本文对一道二面角度数题的解法进行多角度研究,旨在帮助同学们熟悉和掌握二面角的概念、求法,以提高分析问题和解决问题的能力. The dihedral angle is an important content of the three-dimensional geometry. Its size is the same as the size of its plane angle. Therefore, the key to solving such problems is to make its plane angle, and then calculate the solution by solving the plane angle in a certain triangle. Many students make The plane angle is difficult and the calculation is also difficult. For this reason, this paper conducts a multi-angle study on the solution of a two-sided angle problem to help students familiarize themselves with the concepts and methods of the dihedral angle in order to improve the analysis and problem solving. ability.