A perpendicular bisector of a chord passes through the centre and bisects the arc. 弦的垂直平分线经过圆心，并且平分弦所对的两条弧。
The article discusses the determination and quality of angular bisector of two lines. 利用二次曲线的射影理论讨论了二直线夹角的平分线的确定与性质。
It is superposition that the bisector of the vertex angle, the median and the height of the base in an isosceles triangle. 等腰三角形的顶角平分线、底边上的中线和底边上的高互相重合，简称“三线合一”。
The method of round or adjustment curve suruey and design is laying geometer out the angle bisector according to cosine the ormern. 全站仪安置在分角线上任意点测设圆曲线,以及缓和曲线原理是根据余弦定理,全站仪测设方法是应用极坐标法进行测设曲线。
