In a plane, if a figure is folded along a straight line, the parts on both sides of the straight line can completely overlap.

Such a figure is called an axisymmetric figure, this straight line is called an axis of symmetry, and the axis of symmetry is represented by a dotted line; At this time, we also say that this figure is symmetrical with this straight line, such as circle, square, isosceles trapezoid and so on.

Axisymmetric definition

Like window grilles, a figure is folded along a straight line. If it can overlap with another graph, the two graphs are said to be symmetrical. This straight line is called the symmetry axis, and the corresponding points in the two graphs are called the symmetry points.

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