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α=60°
OBL V
2r=d*cosα→r=1/2dcosα
h=d*sinα
V=πr²h=π*1/4d²cos²α*dsinα=1/4πd³cos²α*sinα
cos60°=1/2
sin60°=√3/2
V=0,25π*1728*1/4*√3/2=54π√3cm³
ODP
V=54π√3cm³
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