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if ΔA = r2then, Ω= 1 Steradian (1sr)

for a complete sphere, Ω= 4 π sr

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if ΔA = r2then, Ω= 1 Steradian (1sr)

for a complete sphere, Ω= 4 π sr

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A steradian is the solid angle subtended at the centre of a sphere by radius r by a portion of the surface of the sphere which has area r2.

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A steradian.

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65.54

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nopes.

radian is the ratio between the length of an arc and its radius.

A steradian can be defined as the solid angle subtended at the center of a unit sphere by a unit area on its surface. For a general sphere of radius r, any portion of its surface with area A = r2 subtends one steradian.

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