三角形的三条中线相交于一点,这点叫做三角形的重心.三角形的重心具有如下性质:(1)重心到顶点的距离等于它到对边中点距离的2倍;(2)顶点与重心的连线必平分对边.由于重心对转化条件,发掘图形性质具有独到的作用,因此在解某些几何题,特别是有(或隐含)一点分线段为二倍关系的几何题时,构造出三角形的重心,应用上述性质往往可以收到很好的效果.现行课 The center line of the triangle has the following properties: (1) the distance from the center of gravity to the apex is equal to 2 times the distance from the center of the opposite edge; (2) the distance between the apex and the center of gravity Since the center of gravity has a unique effect on the transformation conditions and the nature of the digging graph, when solving some geometric problems, especially if there is (or is implied) The center of gravity of the triangle, the application of these properties can often receive very good results