- A semicircular instrument for measuring and constructing angles.
- An adjustable pattern used by tailors.
- Anatomy. A muscle that extends a limb or other part.
protractor
Dictionary:
pro·trac·tor (prō-trăk'tər, prə-)  |
n.
| 5min Related Video: protractor |
| Britannica Concise Encyclopedia: protractor |
For more information on protractor, visit Britannica.com.
| Architecture: protractor |
An instrument graduated in angular degrees for measuring or laying out angles.
| Veterinary Dictionary: protractor |
An instrument for extracting foreign bodies from wounds.
| Word Tutor: protractor |
IN BRIEF: An instrument used in geometry for drawing and measuring angles.
Math students will use the protractor to measure the angles of the parallelogram.
| Wikipedia: Protractor |
In geometry, a protractor is a circular or semicircular tool for measuring an angle or a circle. The units of measurement utilized are usually degrees.
Some protractors are simple half-discs; these have existed since ancient times. More advanced protractors, such as the Bevel Protractor have one or two swinging arms, which can be used to help measure the angle.
Contents |
Bevel Protractor
A Bevel Protractor is a graduated circular protractor having a pivoted arm; used for measuring or marking off angles. Sometimes vernier scales are attached to give more accurate readings. It has wide application in architectural and mechanical drawing although with the availability of modern drawing software or CAD the tool is less commonly used in that sphere.
Universal Bevel Protractors are also used by toolmakers, as they measure angles by mechanical contact they are classed as mechanical protractors.[1]
Gallery
 A half circle protractor marked in degrees (180 degrees). |
 A 360° protractor marked in degrees. |
 Another 360° protractor marked in degrees. |
 A "Cras Navigation Plotter" double-protractor, in foreground. |
See also
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Wikimedia Commons has media related to: Category:Protractors |
References
- ^ Farago, Francis T; Curtis (1994). Handbook of Dimensional Measurement. Industrial Press Inc. pp. 580. ISBN 0831130539. http://books.google.co.uk/books?id=eVQPSr8nWekC&pg=PA255&lpg=PA255&dq=bevel+protractor+how+to+use&source=web&ots=5YQqaa7UOT&sig=6Ey33U8eNRPiBBYQe32nsoPyryQ&hl=en#PPA253,M1.
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
- [1] Picture of bevel protector.
- [2] Different bevel protectors.
- Inspection Methods - Angular Measurement
 |
This geometry-related article is a stub. You can help Wikipedia by expanding it. |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
| Translations: Protractor |
Dansk (Danish)
n. - gradmåler, transportør
Nederlands (Dutch)
gradenboog, transporteur, strekkende sier, iemand die iets lang(er) laat duren
Français (French)
n. - (Math) rapporteur
Deutsch (German)
n. - Winkelmesser
Ελληνική (Greek)
n. - μοιρογνωμόνιο, (ανατ.) προελκτικός μυς
Italiano (Italian)
procrastinatore, goniometro, estrattore
Português (Portuguese)
n. - compasso (m)
Русский (Russian)
транспортир, угломер
Español (Spanish)
n. - transportador, músculo protractor
Svenska (Swedish)
n. - gradskiva, vinkelmätare, transportör, protraktor (muskel)
中文（简体）(Chinese (Simplified))
半圆规, 伸肌, 分度器, 拖延者
中文（繁體）(Chinese (Traditional))
n. - 半圓規, 伸肌, 分度器, 拖延者
한국어 (Korean)
n. - 각도기, 오래 끄는 사람
العربيه (Arabic)
(الاسم) منقله, مقياس, الزوايا
עברית (Hebrew)
n. - מדזווית, שריר המרחיב צלע וכו', מאריך
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Learn More
 | protracter |
| bevel protractor |
| parallel motion protractor (graphic arts) |
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Copyrights:
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved. Read more |
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| Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more |
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| Word Tutor. Copyright © 2004-present by eSpindle Learning, a 501(c) nonprofit organization. All rights reserved. eSpindle provides personalized spelling and vocabulary tutoring online; free trial. Read more |
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| Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Protractor". Read more |
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| Translations. Copyright © 2007, WizCom Technologies Ltd. All rights reserved. Read more |
Related answers
- What is a protractor?
- What does a protractor measure?
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Mentioned in
- circle sheet (navigation)
- spirule (graphic arts)
- goniometer
- electrogoniometer
- The Assistant Professor: All About Angles (1992 Children's/Family Film)
- isograph
- protract
- planetography
- Quadrant
- Rudolf Kingslake (photography)
