A protractor is used to draw and measure angles. An angle is the amount of turn between two lines. Angles are measured in degrees with the symbol °. Angles can be labelled with 3 letters (eg DEF) to ...

Protractors, devices for measuring and drawing angles, were used in professional practice as well as by schoolchildren. The instruments manufactured for surveyors, draftsmen, and the like could be of ...

A technician often has to sketch or design ductwork and the other parts of an HVAC system. Sometimes you have to sketch the room or building you are working with. This means working with lines, angles ...