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r in (-oo:+oo)
32008.6283 = (12.56*r^3)/3 // - (12.56*r^3)/3
32008.6283-((12.56*r^3)/3) = 0
32008.6283-4.18666667*r^3 = 0
-4.18666667*r^3 = -32008.6283 // : -4.18666667
r^3 = 7645.37299551
r^3 = 7645.37299551 // ^ 1/3
r = 7645.37299551^(1/3)
r = 7645.37299551^(1/3)
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