与三角形有关的一些计算问题是学习“三角形”知识的重要组成部分,解决这类问题的方法虽因题而异,但适合利用列方程(组)来求解的有不少,现从以下几个方面举例说明:一、求角的度数D=A例C1,AD已=知B△DA,B求C∠中B A,ACB的=度A数C,.D是BC上的点,且C图1分析此题中一个角的度数都不 Some calculation problems related to triangles are an important part of learning “triangular” knowledge. Although the methods for solving such problems vary from question to question, there are many that are suitable for solving using column equations (groups). The following examples illustrate: First, the angle of the degree of evaluation D = A case C1, AD = known B △ DA, B seeking C ∠ BA, ACB = degree A number C, .D is the point on BC, and C 1 Analysis of the degree of one of the angles in this question is not