Radian
From Encyclopedia of Mathematics
The angle corresponding to an arc on a circle with length equal to the radius; thus, 
degrees is 
radians; it is approximately 
. A radian is taken as the unit of measurement of angles in the so-called circular, or radian, measurement of angles. If the circular measure of an angle is 
radian, then the angle contains 
degrees; conversely, an angle of 
has circular measure of 
radians.
How to Cite This Entry:
Radian. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Radian&oldid=31576
Radian. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Radian&oldid=31576
This article was adapted from an original article by BSE-3 (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article