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文 [1 ]P4 7习题 9.7第 4题是 :在一个二面角的一个面内有一点 ,它到棱的距离等于到另一个面的距离的 2部 ,求二面角的度数 .文 [2 ]P4 0给出的答案中 :30°或 1 50° .笔者认为 ,这道习题的题目和答案值得商榷 .1 这是一个病题1 .1 题目的条件不足“在一个二面角的一个面内
The fourth problem of the paper [1] P4 7 Exercise 9.7 is: In a facet of a dihedral, there is a point where its distance from the edge is equal to the distance from the other face, and the dihedral angle is calculated. 2 ]P4 0 given in the answer: 30 ° or 1 50 °. The author thinks that the title and answer of this exercise is worth discussing. 1 This is a problem of the disease in question 1.1.1. "In a dihedral In one face