Difference between revisions of "Radian"
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Revision as of 22:20, 29 August 2006
A radian is a unit of measurement for angles. In a circle, the measure of a central angle in radians is the ratio of the length of the intercepted arc to the length of the circle's radius.
A complete angle has measure 
, since a complete angle "intercepts" the whole circumference of the circle. Thus, radians can be converted to degrees: 
or 
.
