Ruler drawing refers to drawing with scaleless ruler and compasses. Ruler drawing is a mathematical discipline that originated from ancient Greece. Only compasses and rulers are used, and only a limited number of times are allowed to solve different plane geometric drawing problems. Ruler The rulers and compasses used for drawing are imaginary and not exactly the same as those in reality:

1. The ruler must have no scale and be infinitely long, and can only be fixed on one side with the ruler. You can only use it to connect two points together, not the scale on it;

Compasses can be opened to infinite width, but there can't be scales on them. It can only be pulled out to the length of the previous structure.

In the compulsory education stage, the first time students come into contact with a ruler is to draw a line segment equal to a known line segment.

1. Make a line segment equal to a known line segment.

2. Make an angle equal to the known angle.

3. Make the middle vertical line of the known line segment.

4. Make a bisector with a known angle.

5. Make a point perpendicular to the known straight line.

6. It is known that all three sides are triangles.

7. Two angles are known, and one side is a triangle.

8. As we all know, two sides and an included angle form a triangle.

I hope it can help you solve the problem.