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H=2dm=20cm
V=3000cm³
V=π r² H
3000 = 3,14 * r² * 20cm
3000 = 62,8 * r²
r² = 3000I:62,8
r² = 48
r =√48
r ≈ 6,9 cm
Odpowiedź B jest poprawna.