Method for measurement of the angles of polygons

A simple technique is devised to measure the angles of a pentagon and a hexagon without using expensive spectrometers, auto-collimators, and angle gauges. A general technique for measuring the angles of polygons with sides ranging from 5 to 12 is proposed. The technique can be used for carrying out measurements with an autocollimator, when a suitable angle- gauge combination is not available. The method can also be used for both glass and hardened steel polygons with moderate polish.