Axisymmetric figure refers to a figure folded along a straight line in a plane, and the parts on both sides of the straight line can completely overlap. This straight line is called the axis of symmetry.

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 about this line. Such as circle, square, isosceles triangle, equilateral triangle, isosceles trapezoid, etc.

For example, isosceles triangle, square, equilateral triangle, isosceles trapezoid, circle and regular polygon are all axisymmetric figures.