Question 167653
From the solution above:
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Start at S.A. = 2PIr^2 + 2V/r
Set the 1st derivate of dSA/dr = 0 (derivative of SA with respect to r)
4PIr - 2V/r^2 = 0
4PIr^3 - 2V = 0
2PIr^3 - 16PI = 0
r^3 = 8
r = 2
h = 4