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radian
[ rey-dee-uhn ]
noun
, Mathematics.
- the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°. : rad
radian
/ ˈreɪdɪən /
noun
- 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
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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Word History and Origins
Origin of radian1
C19: from radius
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