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A Writer's Dictionary:

radian Definition


Dictionary Home » Words Starting with R » rack-renter ... radiographer » radian


radian
noun
    1. geom.
      The SI unit of plane angular measurement, approximately 57°, defined as the angle that is made at the centre of a circle by an arc (a segment of the circumference) whose length is equal to the radius of the circle.
Etymology: 19c: from radius.



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