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1litr=1dm³
200ml=200×0,001 dm³=0,2dm³
v=½×⁴/₃πr³
0,2=⅔πr³
0,2=⅔×3,14r³
r³=0,2:2,09333
r³≈0,096dm³
r≈∛96cm³
r≈2∛12cm
r≈2×2,3≈4,6cm
srednica=2r= około 9,2cm= około 92mm