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| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| arc, in geometry |
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  radians is s=r; if is measured in degrees, then the arc is given by s=2 r/360. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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