Steradian

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steradian

[stə′rād·ē·ən]
(mathematics)
The unit of measurement for solid angles; it is equal to the solid angle subtended at the center of a sphere by a portion of the surface of the sphere whose area equals the square of the sphere's radius. Abbreviated sr; sterad.

Steradian

 

a unit of measurement for solid angles. It is equal to the solid angle subtended at the center of a sphere by a portion of the sphere’s surface whose area is equal to the square of the sphere’s radius. The abbreviations used for the unit are sr and sterad. The solid angle of a sphere at its center is 4π steradians.