Symmetric graphics are generally called axisymmetric graphics, which are defined as graphics folded along a straight line in a plane, and the parts on both sides of the straight line can completely overlap.
The straight line is called the symmetry axis, and the symmetry axis is represented by the 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.
Axisymmetric graphic properties:
1, the symmetry axis is a straight line.
2. In an axisymmetric figure, the distance between the corresponding points on both sides of the axis of symmetry is equal.
3. Axisymmetric graphics, folded in half along the axis of symmetry, and completely overlapped left and right.
4. If two figures are symmetrical about a straight line, then this straight line is the line segment whose symmetry axis bisects the symmetry point vertically.
5, graphic symmetry.