Goniometer

Jun 10, 2021

A simple angle measuring instrument or for entering an angle is called goniometer or protractor.
It consists of a circular or semi-circular disc with angular graduation.
The disc is usually made of plastic or sheet metal.
Often goniometers are also integrated in drawing or set squares.
More accurate goniometers have a swivelling rail with a scale with length graduation to milimeters, which can be fixed at the desired angle.