初中代数第四册第二章解斜三角形一节,在本章小结中有如下归纳: “解任意三角形的问题有下列四种类型: (1)已知三边; (2)已知两边和它们的夹角; (3)已知两角和一边; The second chapter of the junior high school algebra, Volume II, Chapter on solving oblique triangles, is summarized in the summary of this chapter as follows: “The problem of solving arbitrary triangles has the following four types: (1) Known three sides; (2) Known sides and them (3) Known two corners and one side;