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求二面角的大小.基本方法是先定平面角,再求二面角,但平面角没有固定位置,因而容易出错.本文介绍几种方法,帮助同学们掌握规律。
For the size of dihedral, the basic method is to set the plane angle first, and then find the dihedral angle, but there is no fixed position on the plane angle, so it is easy to make mistakes. This article introduces several methods to help students master the law.