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V=a³
V=8³
V=512cm³ objętośc sześcianu
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r=a/2
r=8:2
r=4cm
H=8cm
Vw=πr²H
Vw=4²*8π=16*8π=128π cm³
π≈3,14
Vw=128*3,14=401,92 cm³ objętośc walca
100%*401,92/512 =100%*0,785 =78,5%