三角形的三条高线交于一点,称为垂心,可见,经过三角形一个顶点与其垂心的连线垂直于对边.事实上,任何两条高的交点,就是垂心.如能灵活运用这一性质,不少问题往往可以事半功倍地得到解决. The three high lines of the triangle intersect at one point, called the vertical center, and it can be seen that the line passing through one vertex of the triangle and its vertical is perpendicular to the opposite side. In fact, any two high points of intersection are vertical. If we can use this property flexibly, Many problems can often be solved with half the effort.