角的平分线上的点到角的两边的距离相等,这是角的平分线的性质;反过来,角的内部到角的两边距离相等的点在角的平分线上,这是角的平分线的判定.角的平分线的性质与判定是证明两条线段和两个角相等的重要定理.在学习时,应注意如下三点: The distance between the points on the bisector of the angle is equal to the distance between the two sides of the angle, which is the nature of the bisector of the angle; on the other hand, the point where the distance from the inside to the corner of the angle is equal to the bisector of the angle is the bisector of the angle Line judgment.The nature and judgment of the bisector of the corner is an important theorem to prove that the two line segments and the two corners are equal.In the study, we should pay attention to the following three points: