三角知识是高中数学知识的重要组成部分 ,思维灵活 ,变化多端 ;向量知识进入中学数学教材后 ,由于向量把数和形融为一体 ,为三角问题的解决提供了更为广阔的空间 ,同时三角也为平面向量提供了展示的舞台 .下面就三角和平面向量的结合方面 ,例谈平面向量在三角中的简单应用 1　 Triangular knowledge is an important part of high school mathematics knowledge. It is flexible in thinking and varied; after vector knowledge is introduced into mathematics textbooks in middle schools, the vector integrates numbers and shapes to provide a broader space for solving triangular problems. Also provides a stage for the display of the plane vector. Here is a simple application of the plane vector in the triangle with respect to the combination of the triangle and the plane vector.