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r=12cm=1,2dm
v=½×⁴/₃πr³=⅔π×1,2³=1,152×3,1=3,5712dm³, pojemnośc =3,5712 litra
b]średnica=30cm
r=15cm=1,5dm
v=½×⁴/₃πr³=⅔×3,1×1,5³=6,975dm³, pojemność=6,975 litra