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tgα=r/(H-h)
tgα=R/H
R/H=r/(H-h)
R(H-h)=rH
6(H-4)=4H
6H-24=4H
2H=24/:2
H=12
h₂ wysokosc stozka scietego h₂= H-h=12-4=8
V=1/3πr²h₂=1/3π4²*8=1/3π16*8=128/3π