定义1三角形顶点及对边分点的连线称之为三角形的分点线.定义2由三角形分点线围成的三角形称之为分点线三角形.图1三角形如图1,△ABC的边AB,BC,CA上的分点分别为D,E,F;AE和CD,BF和AE,CD和BF分别交于点P,Q,R.则CD,BF,AE称之为△ABC的分点线,△PQR称之为△ABC的分点线三角形.我们 Definition 1 The connection between the vertices of the triangle and the points on the opposite side is called the dotted line of the triangle. Definition 2 The triangle enclosed by the triangle dividing lines is called the dotted line triangle. Figure 1 The triangle is shown in Fig. 1, △ABC The points on the sides AB, BC, and CA are D, E, and F; AE and CD, BF and AE, and CD and BF are intersected at points P, Q, and R. The CD, BF, and AE are called △ABC. The dotted line, △PQR called △ABC dotted triangle.