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Technical Reference  Navigation:   HOME | technical reference overview > miscellaneous > miscellany > protractors Protractors In geometry, the protractor is a circular or semicircular tool for measuring angles. The units of measurement utilised are usually degrees. Some protractors are simple half-discs; these have existed since ancient times. More advanced protractors usually have one or two swinging arms, which can be used to help measure the angle. A proctactor can be used in lighting design to help determine the diameter of a spotlight beam at a given beam angle when designing a lighting rig. Need a protractor? Forgot your pencil case? Download and print the protactor below! See also: Go back techref.info website © Copyright 2006-2012 Please read the Conditions of Use of this website. Need help? Go to Helpdesk