To measure angles using a protractor it’s a pretty straightforward process. How to use a protractor to measure angles It has a baseline that points to 0° and 180° for both scales and in the middle of the base line you will notice the center that you can place on a vertex to measure an angle. The outer scale starts from 0° to 180° going clockwise (left to right) while the inner scale starts from 0° to 180° going anti-clockwise (right to left). Protractors have traditionally been one-sided with many have one or two scales. So 1° (degree) = 60 arcminutes and 1 arcminute = 60 arcseconds.Ī protractor is commonly used in geometry lessons by elementary school students where they learn how to measure angles. An arcminute is the 60th part of a degree. There are also protractors that are built for precision which further divide degrees into arcminutes. You may also find some that are divided in 90 (quarter of a circle) and 360 (full circle) equal parts. There are protractors divided into different parts, but the must commons are divided in 180 equal parts (half of circle or half-disc). Measuring angles with a protractor is usually done in degrees (°) and sometimes in radians (rad or c). How to use a protractor to measure anglesĭefinition: A protractor is a measuring tool made from different materials, typically plastic, glass or metal (in our case, paper), and it’s used for measuring, drawing or plotting angles.
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