1. T-square: a tool for drawing horizontal lines, used in conjunction with a triangle. Generally, it can be directly used to draw parallel lines, and can also be used as the support of a triangular plate to draw straight lines at various angles with a ruler. T-square is mostly made of wood or plastic, and can also be made of transparent plexiglass. Generally, there are three specifications: 600 mm, 900 mm, 1200 mm.

2. Compass: It is a tool used to draw circles or arcs in mathematics and cartography. Compasses are usually made of metal and consist of two hinged parts, which can be adjusted. Compasses are divided into ordinary compasses, spring compasses, point compasses, beam compasses, old compasses, mechanical pencil compasses and movable small compasses.

3, protractor: drawing tools, common materials are plastic or iron, commonly used compasses.