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arc

The Columbia Encyclopedia, Sixth Edition | 2008 | Copyright

arc in geometry, a curved line or any part of it; in particular, a portion of the circumference of a circle. The length s of an arc of a circle of radius r and subtending a central angle of θ radians is s = r θ; if θ is measured in degrees, then the arc is given by s =2π r θ/360.

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"arc." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 10 Feb. 2010 <http://www.encyclopedia.com>.

"arc." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (February 10, 2010). http://www.encyclopedia.com/doc/1E1-arc-geo.html

"arc." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved February 10, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-arc-geo.html

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