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Steradian

A unit of solid-angle measure in the International System of Units (SI)

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The steradian is a unit of solid-angle measure in the International System of Units (SI). It is defined as

  • the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere’s radius.

The complete surface area of a sphere is 4π times the square of its radius and

  • the total solid angle about a point is equal to 4π steradians.
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    Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more.

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