如果两个三角形能够完全重合,那么这两个三角形是全等三角形.两个三角形中重合的顶点叫做对应顶点,互相重合的边叫做对应边,互相重合的角叫做对应角.性质:全等三角形的对应边相等,对应角相等,对应的高、角平分线、中线相等. If the two triangles can completely coincide, then the two triangles are congruent triangles, the vertices of the two triangles overlap each other are called the corresponding vertices, the coinciding edges are called the corresponding edges, and the coinciding corners are called the corresponding angles. The corresponding edges are equal, the corresponding angles are equal, corresponding to the high angle bisector, the median line is equal.