Radian



[rey-dee-uh n] /ˈreɪ di ən/

noun, Mathematics.
1.
the measure of a central angle subtending an arc equal in length to the : equal to 57.2958°.
Abbreviation: rad.
/ˈreɪdɪən/
noun
1.
an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. 1 radian is equivalent to 57.296 degrees and π/2 radians equals a right angle rad
n.

“angle subtended at the center of a circle by an arc equal in length to the radius,” 1879, from radius.

radian ra·di·an (rā’dē-ən)
n.
Abbr. rad
A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.
radian
(rā’dē-ən)
A supplementary unit of the International System used in angular measure. One radian is equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17’44.6″.

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