Verified Answer :

V = \(\frac{1}{3}\)πr²h   Mutiply both sides by 3 to cancel out the fraction
3V = πr²h   Divide both sides by πh
\(\frac{3V}{\pi h}\) = r²   Find the square root of both sides
\(\sqrt{ \frac{3V}{\pi h} }\) = r   Switch the sides to make it easier to read
r = \(\sqrt{ \frac{3V}{\pi h} }\) 

Base on my own calculation and the given formula, I would say that the transported formula of the said equation that could get the value of r is r = sqrt of (3v/ pie *H). I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification