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r in (-oo:+oo)
100.48 = 3.14*6*(1/3)*r // - 3.14*6*(1/3)*r
100.48-(3.14*6*(1/3)*r) = 0
100.48-6.28*r = 0
100.48-6.28*r = 0 // - 100.48
-6.28*r = -100.48 // : -6.28
r = -100.48/(-6.28)
r = 16
r = 16
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