Nurgamõõdik

Nurgamõõdik, also known as a protractor, is a measuring instrument used for determining angles. Typically, it is a flat, semi-circular or circular disk marked with degrees from 0 to 180 or 0 to 360. The straight edge of a semi-circular protractor is often used as a baseline for measurement, with the center mark aligned with the vertex of the angle.

Protractors are commonly made from transparent plastic, allowing the user to see the lines or points of the angle being measured. They are essential tools in geometry, drafting, engineering, and various technical fields where precise angle measurement is required. Besides measuring existing angles, a protractor can also be used to draw angles of a specific degree.

There are different types of protractors. The most common is the semi-circular protractor, which measures angles up to 180 degrees. A full-circle protractor measures up to 360 degrees. Specialized protractors exist for specific applications, such as bevel protractors used in metalworking to measure or set angles of machine tool cutters. The accuracy of a protractor is determined by the fineness of the markings and the quality of its construction.