四面体的另一种空间角的正弦定理刘毅（齐齐哈尔教育学院１６１００５）文［１］中我们定义了三面角的一种特征值（为明确起见，本文约定称其为三面角的第一种特征值），并给出了相应的三角形正弦定理在四面体的类比定理．本文将定义三面角的另一种特征值，并给出相应的三... Another sine theorem for the tetragonal space angle Liu Yi (Qiqihar Institute of Education 1610005) We defined an eigenvalue of the trihedral angle in [1] (for the sake of clarity, the first type of paper is called the trihedral angle in this paper). The eigenvalues), and give the corresponding triangle sine theorem in the tetrahedron’s analogy theorem. This article will define another eigenvalue of the trihedral angle and give the corresponding three...