Cylinder express radius

Please express r from the formula for the surface of the cylinder.

Correct answer:

r = (sqrt(2S/π + v^2) - v)/2

Step-by-step explanation:

S = 2πr(r+v) S = 2 π r2 + 2 π r v  2 π r2 + 2 π r v  S = 0 s = 2 π b = 2 π v c = S  r12 =  2ab ±b24ac  r>0  r = 21 (π2 S + v2  v)  r=(2S/π+v2v)/2



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