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## A unit of solid-angle measure in the International System of Units (SI)

The steradian is a unit of solid-angle measure in the International System of Units (SI). It is defined as

• the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere’s radius.

The complete surface area of a sphere is 4π times the square of its radius and

• the total solid angle about a point is equal to 4π steradians.

## Related Topics

• ### Mathematics

Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more.

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• ### Angle Converter

Converting between angle units.
• ### Minutes vs. Degrees - Converting Chart

Convert from minutes to degrees.
• ### Polar vs. Cartesian Coordinates

Convert between Cartesian and Polar coordinates.

Radian is the SI unit of angle. Convert between degrees and radians. Calculate angular velocity.
• ### SI System

An introduction to the SI metric system.

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## Citation

• The Engineering ToolBox (2022). Steradian. [online] Available at: https://www.engineeringtoolbox.com/steradian-d_2195.html [Accessed Day Month Year].

Modify the access date according your visit.

7.8.15

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