The multi-function triangle ruler is a circle drawing mechanism composed of a rotating ring and a rotary table at the two sharp corners of the original triangle ruler, a needle-shaped angle drawing mechanism at the protractor, a frame at the bottom edge, and a slot rail in the frame. The slot rail is equipped with a positioning mechanism composed of a distance plate, elastic material, slide plate and a parallel line drawing mechanism composed of a slide block embedded in the slot for sliding.

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.