steradian

steradianIf A = r2 then solid angle Ω = 1 sr.

ste·ra·di·an

S0742300 (stĭ-rā′dē-ən)n. Abbr. sr A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared. The total solid angle of a sphere is 4π steradians.

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[ste(reo)- + radian.]

steradian

(stəˈreɪdɪən) n (Units) an SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius. Symbol: sr [C19: from stereo- + radian]

Thesaurus

Noun

1.

steradian - the unit of solid angle adopted under the Systeme International d'Unitessrangular unit - a unit of measurement for anglessphere - a three-dimensional closed surface such that every point on the surface is equidistant from the center

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