Find equidistant points with compasses, and connect two points into a straight line with a ruler, and you can complete the drawing:

1 is a straight line and a circle;

Make a circle and make its diameter;

3 make a line segment and make its vertical average line;

3 cross a point on a straight line and make a vertical line of the straight line;

4 make a straight line parallel to the known straight line and make a parallelogram;

5. Divide a paragraph into several equal parts;

6 bisect an angle;

7 make a 30-degree angle;

8 make a 60-degree angle; Make a regular triangle;

9 trisection, sexection and arbitrary bisection of the circumference;

10 is a regular polygon;

1 1 is a simple symmetrical graph;

There are also some drawings that can be made with a ruler.