角平分线是指在角的内部,到角的两边距离相等的点的集合,它是一条以角的顶点为端点的射线.角平分线具有很好的几何性质,角平分线所在直线是角的对称轴,三角形中的内角平分线除具有角平分线的一般性质外,还具有两条基本的常用性质.三角形的内角平分线有如下的重要性 The angle bisector is the set of points within the corner that are equally spaced from each other on both sides of the corner, which is a ray that takes the vertex of the corner as the endpoint. The angular bisector has good geometry and the line where the angle bisector is is the corner Symmetry axis of the triangle, the bisector of the interior angle in the triangle has two basic common properties in addition to the general properties of the bisector of the angle. The bisector of the interior angle of the triangle has the following importance