正、余弦定理的一个重要应用就是根据已知条件判断三角形的形状,这是一类常见的解斜三角形问题。下面通过具体例子介绍判断三角形形状的几种常用方法,供同学们学习时参考。 An important application of positive and cosine theorems is to judge the shape of a triangle according to known conditions, which is a common problem of solving oblique triangles. The following examples through the specific examples to describe the triangle shape of several commonly used methods for students to learn reference.