相似三角形有以下几个重要性质: (1)对角相等,对应边成比例; (2)对应线段的比等于相似比,即相似三角形对应边的比、对应中线、对应角平分线、对应高、对应周长的比都等于相似比; Similar triangles have the following important properties: (1) The diagonal angles are equal and the corresponding edges are proportional; (2) The ratio of the corresponding line segments is equal to the similarity ratio, that is, the ratio of the corresponding sides of similar triangles, the corresponding midline, the corresponding angle bisector, and the corresponding height. The ratio of the corresponding perimeters is equal to the similarity ratio;