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If the figure is folded along a straight line and the parts on both sides of the line can overlap each other, this figure is called the axisymmetric figure, and this straight line is its axis of symmetry. Fold a figure along a straight line, if it can completely coincide with another figure, then the two figures are said to be axisymmetric with respect to the straight line. This straight line is the axis of symmetry, and the points that can coincide in the two figures are called symmetry points.
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