steradian
See Also: radian
[Euclidean geometry] The solid (conical) angle subtended at the center of a sphere of radius r by a bounded region on the surface of the sphere having an area r squared. There are 4π steradians in a sphere.
steradian
The solid (conical) angle subtended at the center of a sphere of radius r by a bounded region on the surface of the sphere having an area r squared. There are 4π steradians in a sphere. Referenced by: Angle; Degree (angle); Steradian.
 See also: Area, Surface, Sensor, Image, Information
  
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