How to solve for the variable which is r

asked Aug 18, 2018 12.5k views

3 votes

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1 vote

the x is the r because x is the variable and r is a variable

Nikkole answered Aug 21, 2018

8.3k points

4 votes

I think, not 100% sure, but I think it is square root (A/4pi)=r

Martin Reiche answered Aug 22, 2018

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