Protractors For Use As Drawing Instruments

Protractors For Use As Drawing Instruments

A protractor is a measuring instrument used in geometry and technical drawing to measure angles. It consists of a flat, circular disk with a scale of degrees marked around the edge and a rotating arm or pointer that can be set to any desired angle. The disk is usually made of transparent plastic or glass, so that it can be placed directly over a drawing to measure angles accurately. Protractors are commonly used in a variety of fields, including engineering, architecture, and design. There are two main types of protractors: the semicircular protractor and the full-circle protractor. The semicircular protractor is a half-circle with a scale of degrees marked along the curved edge, while the full-circle protractor is a complete circle with a scale of degrees marked around the entire circumference. Both types of protractors can be used to measure angles ranging from 0 to 180 degrees. Protractors are typically used in conjunction with other drawing instruments, such as rulers and compasses, to create accurate technical drawings. They are used to measure angles for a variety of purposes, such as determining the slope of a roof or the angle of a corner in a building. Protractors are also used in trigonometry to calculate the values of sine, cosine, and tangent functions. In addition to traditional protractors, there are also digital protractors that use electronic sensors to measure angles. These devices are often more accurate than traditional protractors and can display measurements in both degrees and radians.

measuring instrument, geometry, technical drawing, semicircular protractor, full-circle protractor, accuracy

— Jason Moore

CITATION : "Jason Moore. 'Protractors For Use As Drawing Instruments.' Design+Encyclopedia. https://design-encyclopedia.com/define/protractors-for-use-as-drawing-instruments?E=399231 (Accessed on October 14, 2026)"