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Cut an axisymmetric shape with paper in the third grade of primary school.
If a figure is folded in half along a straight line, the two ends are completely coincident.

Such a figure is called a symmetrical axis figure.

This straight line is called the axis of symmetry. For example, isosceles triangle, square, isosceles tripod, isosceles trapezoid and circle are all axisymmetric figures. Some axis-to-city graphs have more than one axis of symmetry.