在直角坐标系下的三角形的面积问题,是近几年数学中考试卷中最常见的题型,并且大部分题目是作为压轴题出现的.对于此类问题的解答,教材上基本上没有涉及,学生平时很少做这方面的训练.因此,不少考生面对题目,不能迅速地找到解决问题的方法,甚至无从下手,基于这一情况,笔者根据三角形在直角坐标系下的 The problem of the area of ​​the triangle in Cartesian coordinates is the most common type of examination paper in mathematics in recent years, and most of the questions appear as the acupuncture problems.For the solution of such problems, the textbooks are basically not involved, Therefore, many candidates face the problem, can not quickly find a solution to the problem, or even start with, based on this situation, the author based on the triangle in the Cartesian coordinate system