数学学习或研究离不开定理,学习过的定理是后续学习和研究的基础.对于性质定理不论是老师还是学生相信都特别熟,性质定理的特点为:哪一个图形的性质,这个图形就怎么样…….例如等腰三角形的性质为:等腰三角形两底角相等;等腰三角形顶角平分线,底边上的中线,底边上的高线互相重合;三角形中位线的性质定理为:三角形的中位线平行于第三边,且等于第三边的一半;等等不胜枚举.一般来说,如果其逆定理存在,即为该图形的判定定理.如等腰三角形两底角相等的逆定理为,有两个角相等的三角形是等腰三角 Mathematics learning or research is inseparable from the theorem, learning the theorem is the basis for follow-up study and research.For the nature of the theorem, whether teachers or students believe that are particularly familiar with the nature of the nature of the theorem is: what the nature of the graphics, the graphics on how Such as the isosceles triangle of the nature of: isosceles triangle two bottom angles are equal; isosceles triangle vertex bisector, the bottom of the center line, the bottom line of the high line coincide with each other; As follows: the median line of the triangle is parallel to the third side and equal to half of the third side, etc. In general, if the inverse theorem exists, it is the judgment theorem of the graph, such as isosceles triangle two The inverse theorem that the bottom corners are equal is that there are two equal triangle isosceles triangles