Grid diagram: also called standard diagram, it is used to standardize the size, minimum size, usable range, position, spacing, proportion, the relationship between logo and enterprise name, and the specifications for later use.
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, and you can't draw scales on them;
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 stage of compulsory education, students' first contact with rulers is to "make a line segment equal to a known line segment".
Extended data
Recognizing the following five premises and using the following five public laws in a limited time, the drawing method is legal ruler drawing:
These five prerequisites are:
(1) allows you to select any point within a certain range on a plane, a straight line or an arc (the so-called "certain range" is based on the following four rules).
(2) The position order of different points on the same straight line can be judged.
(3) The position order of different points on the same arc can be judged.
(4) It can be judged which side of the straight line a point on the plane is on.
(5) It can be judged whether a point on the plane is inside or outside the circle.
affect
If the drawing tools are not restricted, the three major problems of geometry can be easily solved. Many mathematical achievements in history are by-products of solving three major problems, especially the study of conic curves and the discovery of a number of famous curves. Not only that, the three major problems are also related to the branches of modern algebra such as equation theory and group theory.