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R=3cm
V=4/3 πR³
4V=16/3 πR³
4v=16*3³π/3 =16*9π =144π cm³ objętośc walca
r=2cm
V=πr²*H
H=V/(πr²)
H=144π/(2²π)=144π/4π =36
H=36 cm