The term protractor is used both in technics and surgery.

In surgery, protractor means a forceps, extractor or pincer, used to remove foreign objects from wounds or sutures.

In technics, protractor is a circular or semicircular tool for measuring angles. The units of measurement utilized are 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. Protractors are not always perfectly accurate when measuring angles. If available, Computer Software that measure angles is a more accurate alternative.

External links

• Printable protractor for download
• More printable protractors

Mathematical tools | Dimensional instruments | Technical drawing

Winkelmesser | Transportador | Rapporteur | 分度器 | Kątomierz | Transferidor | 量角器