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Encyclopedia > SI supplementary unit

Until 1995, SI (International System of Units) supplementary units were: 1995 was a common year starting on Sunday of the Gregorian calendar. ... The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. ...

Quantity Symbol Name of SI supplementary unit Symbol for SI unit
angle θ radian rad
solid angle Ω steradian sr

As of October 1995, the category of "supplementary units" has been abolished from the SI system of measurement, and the radian and the steradian are now considered SI derived units. See Radian (band) for the Austrian trio. ... The steradian (ste from Greek stereos, solid) is the SI derived unit of solid angle, and the 3-dimensional equivalent of the radian. ... 1995 was a common year starting on Sunday of the Gregorian calendar. ... SI derived units are part of the SI system of measurement units and are derived from the seven SI base units. ...


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The angle subtended at the center of a circle by an arc of circumference equal in length to the radius of the circle is one radian.
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