High Quality Student Supplies Engineering Standard Drawing Sets Stationery

The sharp angles of the slender triangle ruler are 30 ° and 60 ° respectively. Two identical slender triangular rulers can form an equilateral triangle. The length of the beveled edge of the slender triangle ruler is twice the length of the short square edge.

The most taboo thing about rulers is the scratching and blurring of the engraved value, so rulers become the most protected articles in stationery. The use of rulers should be correct. For example, it is better not to use plastic rulers when delimiting materials, which will easily be scratched. Many people will make a mistake, that is, they will draw the line very fast, and then they will run along the ruler because of the slippery characteristics of the ruler, which will make the value, so the speed is moderate.