How to cut the axis symmetry?

Preparation materials: scissors, pen and paper.

1. Fold the paper horizontally and vertically.

2. Draw half of the axisymmetric figure along the folded part of the paper.

3. Cut the diagonal, and the cut and the rest are triangles. Unfolding it, a symmetrical figure is formed.

Axisymmetric theorem;

Theorem 1: Two graphs symmetric about a straight line are conformal.

Theorem 2: If two figures are symmetrical about a straight line, then the symmetry axis is the perpendicular line connecting the corresponding points.

Theorem 3: Two figures are symmetrical about a straight line. If the axis of symmetry intersects the extension lines of two symmetrical line segments, the intersection point is on the axis of symmetry.

Theorem 3 Inverse Theorem: If the straight line connecting the corresponding points of two graphs is vertically bisected by the same straight line, then the two graphs are symmetrical about this straight line.

Typical origami art:

Northeast window grillage is a very famous origami technique, and its characteristics are mainly reflected in the following aspects: the pattern is mainly composed of vivid figures, vivid animal images and profound flower-and-bird patterns, which not only has beautiful visual effects, but also is rich in the connotation of traditional culture.

Every detail of origami has been polished repeatedly, with high folding accuracy, smooth lines and precise knife work. Every design has a strong local culture and historical connotation. They are not only beautiful works of art, but also vivid stories that inherit the northeast folk history and local culture.