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Words related to radian

ra·di·an
R r

  • milliradian

    one thousandth of a radian.

  • principal argument

    the radian measure of the argument between −π and π of a complex number. Compare argument (def 8c).

  • steradian

    a solid angle at the center of a sphere subtending a section on the surface equal in area to the square of the radius of the sphere. Abbreviation: sr.
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