边和角是三角形的两个基本要素,它们之间不仅有定性的结论(大边对大角,小边对小角,两边之和大于第三边,两边之差小于第三边),还有定量的结论(三角形内角和定理,三角形的一个外角等于和它不相邻的两个内角的和),而角平分线作为三角形的又一常见要素,会有哪些结论呢? Edge and corner are the two basic elements of the triangle, not only between the qualitative conclusions (big edge to big corner, small edge to small corner, the sum of the two sides is greater than the third side, the difference between the two sides is less than the third side), and quantitative (Triangle interior angle and theorem, the outer angle of a triangle is equal to the sum of two interior angles that are not adjacent to it), and what is the conclusion that an angle bisector is another common element of a triangle?