Question

How many radians account for a circumference of a circle? How many steradians account for a circumference of a sphere?

Answer 1

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Answer 2

Explanation:

A sphere subtends 4 pi square radians (steradians) about the origin. By analogy, a circle subtends 2 pi radians about the origin. Numerically, the number of steradians in a sphere is equal to the surface area of a sphere of unit radius.

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