在三角形中,连接一个顶点和它的对边的中点的线段叫做三角形的中线.一个三角形共有三条中线.关于三角形的中线,有哪些重要的结论呢?结论1三角形的三条中线相交于一点,这点叫做三角形的重心.结论2三角形一边上的中线将这个三角形分成两个面积相等的三角形.拓展:如果两个三角形同高等底(即高相同底相等),那么它们的面积相等.结论3三角形的三条中线将这个三角形分成六个面积相等的三角形. In a triangle, the line connecting the vertex and the midpoint of its opposite edge is called the center line of the triangle. There are three center lines in a triangle. What are the important conclusions about the center line of the triangle? Conclusion 1 The three center lines of the triangle intersect at one point, This is called the center of gravity of the triangle Conclusion 2 The center line on one side of the triangle divides the triangle into two triangles of equal area.Expansion: If two triangles are of equal height, The triangle’s three center lines divide the triangle into six triangles of equal area.