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d in (-oo:+oo)
301.44 = 3.14*18*(1/3)*(d/2) // - 3.14*18*(1/3)*(d/2)
301.44-(3.14*18*(1/3)*(d/2)) = 0
301.44-9.42*d = 0
301.44-9.42*d = 0 // - 301.44
-9.42*d = -301.44 // : -9.42
d = -301.44/(-9.42)
d = 32
d = 32
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