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It is mostly used in the education sector where students are taught the basics of geometry and how to find and draw angles. Perhaps, the semi-circle protractor or half-circle protractor is the most common and most used type of protractor.
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Some of the most common types of protractors based on their design are as follow There are many types of protractors available in the market with each have its own unique design, working, applications and advantages. In most common configuration protractor has a semi-circular shape that is divided into hundred and eighty parts or a full circular shape divided into three hundred and sixty parts. Depending on the system of measurement, a protractor can have a radian scale or degree scale on it. Protractors are usually made from clear transparent plastic or glass but depending on the usage it can be made from steel and wood too. Vertex mark is used as a reference point for measurement and from here one can measure different angles ranging from 0 to 360 degree. Protractor has a scale that is graduated in angular unit degree, on its outer most circular edge and has a vertex mark right at its center of its base. Among the tools available to measure an angle, a protractor (or engineering protractor) is a simple mathematical and geometrical instrument used for drawing, measuring, and plotting angles.