在我们学习过的三角形、正方形、圆等图形中 ,不论怎样移动图形 ,它的大小和形状都是不改变的 ,这种几何学叫做“刚体几何学” .但是 ,有时候我们只需要研究点、线之间的相关位置或相互联结的情况 ,而不考虑尺寸大小 .这类几何学有人叫它“橡皮几何学” ,它的正式学名叫“拓扑 In the triangles, squares, circles, etc. we have studied, no matter how the graphics are moved, its size and shape do not change. This geometry is called “rigid body geometry.” However, sometimes we only need to study the points. , the relative position between lines or the situation of interconnection, regardless of the size. This type of geometry is called it “rubber geometry”, its official name is called “topology”.