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r = 1/2×70
r = 35 cm = 3,5 dm
V = 462 L = 462 dm³
V = 462
πr²t = 462
22/7×3,5²×t = 462
38,5×t = 462
t = 462:38,5
t = 12 dm = 120 cm
*1 L = 1 dm³