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The steradian (ste from Greek stereos, solid) is the SI derived unit of solid angle, and the 3- dimensional equivalent of the radian. The symbol is sr.

The steradian is defined as "the solid angle subtended at the center of a sphere of radius r by a portion of the surface of the sphere having an area r2." Since the surface area of this sphere is 4πr2, then the definition implies that a sphere measures 4π steradians. A steradian can also be called a squared radian.

A steradian is also equal to the spherical area of a polygon having an angle excess of 1 radian, to 1/4 π of a complete sphere, or to 57.2957795 degrees squared.

The steradian was formerly an SI supplementary unit, but this category was abolished from the SI system in 1995.






Natural units SI derived units of solid angle

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Steradian Sphere Angle Solid Area Radian Surface Derived Unit

Topics: Steradian Sphere Angle Solid Area Radian Surface Derived Unit...

SteradianThe steradian ste from Greek stereos solid) is the SI derived unit of solid angle, and the 3- dimensional equivalent of the radian. The symbol is sr . The steradian is defined as "the solid angle subtended at the center of a sphere of radius r by a portio  


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