Question

the angle subtended at the centre of the sphere by its surface area =

Answer 1

Answer:

Because the surface area A of a sphere is 4πr2, the definition implies that a sphere subtends 4π steradians (≈ 12.56637 sr) at its center. By the same argument, the maximum solid angle that can be subtended at any point is 4π sr.

Explanation:

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