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近年来,在各地中考中出现了一类求动点轨迹的路径长的问题,由于较难确定动点轨迹的形状,往往导致学生无从下手.本文以部分中考题为例,就如何确定动点轨迹的形状进行分类解析,供读者参考.一、直线型动点轨迹事实上,要说明一动点轨迹为直线型(直线、射线或线段),必须证明两点:第一、该轨迹恒过一定点(确定位置);第二、轨迹上任一点与该定点的连线和一定直线的夹角为定值或平行(明确方向).
In recent years, there appeared a kind of long path in the middle school entrance examinations, because it is more difficult to determine the trajectory of the moving point, which often leads to the students unable to start .In this paper, In fact, to illustrate a point trajectory for the linear (straight line, ray or line segment), we must prove that two points: First, the trajectory constant over a certain Point (to determine the location); second, any point on the trajectory and the fixed point of the line and the angle of a certain line is fixed or parallel (clear direction).