初中数学教学中经常遇到一类曲面上的距离问题,这类曲面问题通常需要转化为平面问题来解决.在平面上构造直角三角形,再利用勾股定理,可以解决立体图形中的两点之间的最短距离.在教学中发现,学生在由立体图形转化为平面图形的过程中,找直角三角形的三边是一个难点.下面通过几个例子进行分析,以帮助学生搭建思维的桥梁,从而突破难点. Junior high school mathematics teaching often encounter a class of surface distance problem, this type of surface problems usually need to be transformed into a plane problem to solve.Construct right-angled triangle in the plane, and then use the Pythagorean theorem, you can solve the two-dimensional The shortest distance between the teaching found that students in the process of converting from three-dimensional graphics into a flat graph, the right triangle to find the three sides is a difficult point.Through the analysis of several examples to help students build a bridge of thinking, which Break through difficulties.