Protractor
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A protractor is a 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 1 or 2 swinging arms, which can be used to help measure the angle.
External links
- Printable protractors for download (http://www.thursdaysclassroom.com/13oct00/protractors.html)Template:Math-stub