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【背景与导读】“三角形三边的关系”是北师大版四年级下册的内容。它是在学生初步了解了三角形一些基本知识的基础上进行教学的。三角形三边的关系定理不仅给出了三角形三边之间的大小关系,更重要的是提供了判断三条线段能否组成三角形的标准,熟练灵活地运用三角形的两边之和大于第三边,是数学严谨性的一个体现,同时也有助于提高学生全面思考数学问题的能力,它还将在以后的学习中起着重要的作用。四年级的学生对三角形有了一定的了
【Background and Introduction】 “The Trilateral Triangle ” is the content of the fourth grade under the Beijing Normal University version. It is based on the initial knowledge of the students some basic knowledge of the basis of teaching. Triangle relationship between the triangle not only gives the relationship between the size of the triangle between the three sides, more importantly, to determine whether the three lines can form a triangle standard, skilled and flexible use of the triangle on both sides of the sum is greater than the third side, is A manifestation of mathematical rigor, but also help to improve students’ ability to think about mathematics in a comprehensive manner, it will also play an important role in the future study. The fourth grade students have a certain triangle