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h in (-oo:+oo)
83.8 = 3.14*16*(1/3)*h // - 3.14*16*(1/3)*h
83.8-(3.14*16*(1/3)*h) = 0
83.8-16.74666667*h = 0
83.8-16.74666667*h = 0 // - 83.8
-16.74666667*h = -83.8 // : -16.74666667
h = -83.8/(-16.74666667)
h = 5.00398089
h = 5.00398089
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