Question

what's the answer???
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Answer 1

Supplementary units are the dimensionless units that are used along with the base units to form derived units in the International system. The class of supplementary contains only two purely geometrical units, that is the radian and the steradian.

Answer 2

Two supplementary units :-

They are the radian (unit of plane angle) and the steradian (unit of solid angle). 

Explanation :-

Supplementary units are the dimensionless units that are used along with the base units to form derived units in the International system.

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