Ruler maintenance method

The most taboo of the ruler is the scratching and blurring of the engraved value. Therefore, the ruler has become the most cared item in the stationery. What should we pay attention to when using the ruler? 1. First of all, the method of using the ruler must be correct. For example, it is best…

Introduction of compasses

Compass (a mathematical tool) Compass is a tool used to draw circles or chords in mathematics and drawing, and is often used for drawing with rulers. composition Compasses are usually made of metal and consist of two parts connected by a hinge, which can be adjusted. Classification Compasses are divided into ordinary compasses, spring compasses,…