平面向量作为一种工具,在解题时有着广泛的应用.新课程高考考试大纲对此明确要求:会用向量方法解决某些简单的平面几何问题,会用向量方法解决简单的力学问题与其他一些实际问题.本文利用平面向量知识,推导三角形面积公式的向量形式,并举例说明其应用.1.三角形面积公式的向量形式 Plane vector as a tool for solving problems has a wide range of applications. The new curriculum entrance examination syllabus for this explicit requirements: Will use vector methods to solve some simple plane geometry problems, vector methods will be used to solve simple mechanical problems and other Some practical problems.This paper uses the knowledge of plane vectors to deduce the vector form of triangular area formula and gives an example to illustrate its application.1.The vector form of triangular area formula