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The steradian (symbol: sr) or square radian is the SI unit of solid angle. It is used in three-dimensional geometry, and is analogous to the radian, which quantifies planar angles. Whereas an angle in radians, projected onto a circle, gives a length on the circumference, a solid angle in steradians, projected onto a sphere, gives an area on the surface. The name is derived from the Greek στερεός stereos 'solid' + radian.
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Steradian added 2 new photos to the album Show Posters. 13 February 2015 ·. Show Posters.
The unit of solid angle is the steradian ( ). An area on a sphere, equal to the square of its radius and observed from its centre, subtends precisely one steradian. The solid angle of a sphere viewed from internally is and the solid angle of a face of a cube viewed from the centre is. More technically, we can define the solid and of an object as the cross sectional area presented by divided by an the distance, or the area of a shape on a sphere divided by the radius: This is illustrated below.