Analogue To Radians
In two dimensions, the angle in radians is related to the arc length it cuts out:
-
- where
- l is arc length, and
- r is the radius of the circle.
Now in three dimensions, the solid angle in steradians is related to the area it cuts out:
-
- where
- S is the surface area, and
- r is the radius of the sphere.
Read more about this topic: Steradian
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