Solid angle: Difference between revisions
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imported>Peter Schmitt (This must do for the moment) |
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A '''solid angle''' is a three dimensional | A '''solid angle''' is a three-dimensional generalization of two-dimensional angles. | ||
Simple examples are formed by three or more planes intersecting at a common point. | |||
The unit of measure is the [[steradian]] (sr), an analogue of the [[radian]] (rad) measure for plane angles. | |||
In mathematics, real numbers (without any unit) are used for solid angles because the steradian is dimensionless. | |||
Revision as of 19:05, 20 December 2011
A solid angle is a three-dimensional generalization of two-dimensional angles. Simple examples are formed by three or more planes intersecting at a common point. The unit of measure is the steradian (sr), an analogue of the radian (rad) measure for plane angles. In mathematics, real numbers (without any unit) are used for solid angles because the steradian is dimensionless.