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r in (-oo:+oo)
94.2 = 3.14*10*(1/3)*r // - 3.14*10*(1/3)*r
94.2-(3.14*10*(1/3)*r) = 0
94.2-10.46666667*r = 0
94.2-10.46666667*r = 0 // - 94.2
-10.46666667*r = -94.2 // : -10.46666667
r = -94.2/(-10.46666667)
r = 9
r = 9
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