Simple strokes of compass

compass (yuán guī) In mathematics and drawing, a compass is a tool used to draw circles or chords, and is often used in ruler and compass drawings. Compasses are usually made of metal and consist of two parts connected by a hinge, which can be adjusted. Compasses are divided into ordinary compasses, spring compasses, point compasses, beam compasses, old-fashioned compasses, automatic pencil compasses and small moving center compasses.