Define the SI unit of solid angle.

1.	Define the SI unit of solid angle.
Answer» \xa0A\xa0steradianis the SI unit of solid angle.It can be defined as the solid angle substended at a center of an unit,sphere by a unit area on its surface.For a general sphere of radius r, any portion on its surface with area A=r\u200b\u200b\u200b\u200b\u200b\u200b2

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