Web Reference: The steradian (symbol: sr) or square radian[1][2] is the unit of solid angle in the International System of Units (SI). It is used in three-dimensional geometry, and is analogous to the radian, which quantifies planar angles. A steradian is used to measure solid angles. A steradian is related to the surface area of a sphere in the same way a radian is related to the... A steradian (sr) is the SI unit of solid angle — the three-dimensional analog of the radian. One steradian is the solid angle that, from the center of a sphere, subtends an area on the surface equal to the square of the sphere's radius.
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Steradian Measuring Solid Angles From Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $70M - $104M
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Last Updated: May 22, 2026
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