Question

what are the supplementary s.i. units​

Answer 1

Answer:

Supplementary SI units are dimensionless units that are used along with base units to form derived units in the International System; this class contains only  two, purely Geometrical units: The radian(r) and the steradian (sr).

I hope you find this answer helpful. Mark it as branliest. And click that red or pink button...;-)  

Answer 2

Answer:

SI units which are dimensionless

Explanation:

They are added among with fundamental units. They are of two, radian and setradian.