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abstraction > mathematical concept > unit > solid angle unit

solid angle unit
subject			fact

solid angle unit	is a unit of solid angle
	is a kind of unit
unit	has historical origin
	represents

Kinds of solid angle unit :

• steradian (9 facts) (sr, sr, Ω₀) - Unit of solid (three-dimensional) angular measure. One steradian is equal to the angle subtended at the centre of a sphere by an area of surface equal to the square of the radius. The surface of a sphere subtends an angle of 4π steradians at its centre.