Steradian
Unit of solid angle
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The steradian or square radian is the unit of solid angle in the International System of Units. It is used in three dimensional geometry, and is analogous to the radian, which quantifies planar angles. Wikipedia
Unit of: solid angle
Symbol: sr
1 sr in: is equal to
SI base units: 1 m2/m2
square degrees: 32400/π2 deg2; ≈ 3282.8 deg2
Unit system: SI