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h in (-oo:+oo)
3.14*(h/2) = 4.3 // - 4.3
3.14*(h/2)-4.3 = 0
1.57*h-4.3 = 0 // + 4.3
1.57*h = 4.3 // : 1.57
h = 4.3/1.57
h = 2.7388535
h = 2.7388535
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