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(3)三角形的高线从三角形的顶点向它所对的边(或边的延长线)作垂线,得到垂足,以顶点和垂足为端点的线段就称为该边上的高,高所在的那一条直线叫做高线.在不同的三角形中,高的位置是不同的.
(3) The high line of the triangle is perpendicular to the edge (or the extension of the edge) of the line from the vertex of the triangle to the foot, and the line segment with the vertex and foot point as the endpoint is called the height of the edge. The line where Gao is located is called the high line. In different triangles, the high position is different.