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Like window grilles, a figure is folded along a straight line. If it can completely coincide with another figure, these two figures are called axisymmetric. This straight line is called axisymmetric, and the corresponding points in the two graphs are called symmetrical points. Fold a graph along a straight line. If the parts on both sides of the straight line can overlap each other, then the graph is called an axisymmetric graph, and this straight line is the axis of symmetry. The distance from the symmetry point to the symmetry axis is equal.