Sicong Liu, Jiayi Xu, Rongling Li, Xin Guo, Boyang Hu
Description(English)
The compasses Combining the protractor's dial with the legs, it can be used alone instead of the protractor. With the scale on the compasses’ legs, users can directly draw arcs with presetting angles and accurately measure the angle of any arc, which not only simplifies the drawing process of using compass and protractor alternately but also greatly improves the efficiency and accuracy of drawing, reduces the number of tools, and is more portable.