二面角是立体几何中重要的概念,高频率地出现在高考题中,其中“无棱”二面角的问题,由于其棱在示意图中隐而未现,学生往往因不能正确地作出其平面角而使解题搁浅.本文通过典型例子来探析“无棱”二面角问题的求解途径,旨在引导学生多角度、多层次地探索问题,培 The dihedral angle is an important concept in the three-dimensional geometry. It appears in the college entrance examination question with high frequency. The problem of the “bent-angled” dihedral angle is caused by the fact that the edges of the dihedral angle do not appear in the diagram, and students often fail to make it correctly. Plane angles make the solution problem aground. This paper uses typical examples to explore the solution to the problem of dihedral angles without edges, aiming to guide students to explore problems from multiple angles and levels.