在解代数几何综合题时,我们常常会遇到平面直角坐标系中求三角形面积的问题,还往往会与函数图像相结合.有的三角形面积比较好解决,有的三角形面积求解就比较棘手,仅靠S△=12ah是不够的.下面给同学们梳理一下:一、如果三角形恰有一边在某坐标轴上如图1,边BC落在y轴上,这种情况较简单,把落在轴上的边BC作底,点A到y轴的 When solving algebraic geometry synthesis questions, we often encounter the problem of finding the area of ​​the triangle in the Cartesian coordinate system, and often combine with the function image. Some triangular areas are better solved, and some triangular areas are more difficult to solve. S △ = 12ah alone is not enough to give the following to sort out the students: First, if the right side of a triangle on the same axis as shown in Figure 1, while the edge of the BC falls on the y-axis, the situation is relatively simple, The edge of the shaft BC as the bottom, point A to y axis