1. Draw a point.

First draw a point and a straight line on the paper with the flat edge of the protractor, and then align the middle position of the protractor with the drawn point.

Mark it

According to the number of scales on the protractor, find out the size and digital position of the angle you want to draw, and then mark the outside of the protractor according to the straight line on the protractor.

Connect two points

After marking, connect two points on one side of a straight line with a protractor, and then draw a straight line against the straight line.

Use of protractor:

The protractor can draw angles, measure angles, draw vertical lines and parallel lines, and measure inclination, verticality and levelness. It can be opened and closed as an internal and external right-angle crutch, and can be intuitively and accurately read as a long and short ruler to draw a circle with a specified size.

Products can be made into three types: a small stationery (mainly made of plastic) suitable for primary and secondary school students; Type B teaching AIDS (mainly made of plastic) are more practical for school teachers; Type C tools (mainly made of stainless steel) are used in factories, workshops, carpenters, mechanics, repairmen and so on.

The protractor is simple in structure, novel and unique in shape, reasonable in design, very flexible in use, and has a wide range of practical values. It has realized multi-purpose of one instrument, improved work efficiency and done a lot of work.

The origin of protractor:

In BC, the Arabs divided the Boxer into 180 blocks, and the horn system was born. People make protractors according to the angle system.