Protractor
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- Protractor also refers to a forceps, extractor or pincer, used to remove foreign objects from wounds or sutures.
In geometry, protractor is a circular or semicircular tool for measuring angles. The units of measurement utilized 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.
[edit] Gallery
 A half circle protractor marked in degrees (180 degrees). |
 A full circle protractor marked in gradians (400 gradians). |
[edit] See also
[edit] External links
- Printable protractor for downloadPDF (38.8 KiB)
- More printable protractors
- How to measure angles with a protractor An interactive animation
- How to draw angles with a protractor An interactive animation
- Angle definition pages with interactive applets that are also useful in a classroom setting. Math Open Reference
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