The folding of the graph is the movement of folding the graph along the axis. In mathematical application, two figures are the same after being folded, and this property can be used to solve problems. In manual labor, many patterns can be obtained after many different folds.

After folding, the two figures are congruent and symmetrical about the dotted line. Folding is the movement of folding graphics along an axis. A folding transformation is a transformation from a plane to itself. After folding, it has the following properties: 1, a graphic that changes the flavor of the graphic and is equal to it. 2. A straight line connecting two points along the axis symmetry is vertically bisected by the axis.